As per the question:
As he knows the definition, so we can say he has a good memory, but as he cannot identify the given set of numbers, it means he has a lack of concept. Hence, Option C is correct.
A good memory and good conceptual understanding are both required in good students. Here Harish has a good memory as he memorizes all the definitions correctly but he fails to recognize them.
Memorization is not an aim of teaching mathematics, because it will only help to grasp the thing but not to make them understand.
Its a responsibility of a teacher to make them clear all the concepts.
Hence, the correct answer is option C.

The sum of any two whole numbers is a whole number.” This property is said to be a closure property.
For example:

5 + 2 = 7

In the case of subtraction, we can say that difference between any two whole numbers is not always a whole number.

5 – 8 = −3 which is an Integer.
Commutative property: p + q = q + p where p and q are any two natural/whole numbers.
Associative property: (p + q) + r = p + (q + r) = p + q + r. This property provides the process for adding 3 (or more) natural/whole number.
Distributive property: It says that p × (q + r) = (p × q) + (p × r).

Remedial teaching is not same as special education. Remedial methods can be used for special needs students but are also used for students who are not performing well in spite of average or higher intellectual abilities and are designed to provide individual attention to students. Special education techniques are however designed to address unique needs of learners.

It combines the best element of the radio and the potentialities of the film such as Motion pictures. The selected scientist can demonstrate a certain experience at one place and this can be (seen at any) corner of the world.

As per the question:

The student is not able to count the total objects, they are facing difficulty to apply abstraction and order irrelevance counting principle.

Abstraction means that children can count different-sized objects and treat them the same numerically.

In order Irrelevance Principle the child understands that the counting can begin with any object in a set and the total will stay the same.

Addition and multiplication are both commutative. Subtraction, division are not. For example,5 + 6 = 6 + 5 but 5 – 6 ≠ 6 – 5.

Commutativity isn't just a property of an operation alone. It's actually a property of an operation over a particular set For example, when we say addition is commutative over the set of real numbers we mean that a + b = b + a for all real numbers a and b. Subtraction is not commutative over real numbers since we can't say that a – b = b – a for all real numbers a and b. Even though a – b = b – a whenever a and b are the same, that still doesn't make subtraction commutative over the set of all real numbers.
Multiplication is associative and 1 also is the multiplicative identity.

I Solids such as sphere does not have plane surface

II. Topmost vertex of a pyramid is known as Apex of the solid

III. There is a defined relationship between edges, vertices and face of an object known as eulers formula.

More is the amount of petrol more will be the distance travelled by the car. Let x litre of petrol is enough for the car to travel 380 km.

⇒ x = 19 litres

Time spent apart in watching T.V. = 4 hours

Time apart in sleeping = 8 hours

Total average time spent = (4 + 8) /2

= 6 hours

A Scalene triangle has no line of symmetry.