Germicide = a substance or other agent which destroys harmful microorganisms like germs etc

Foregone = a result that is obvious to everyone even before it happens

Gratis = without charge; free

Glutton = an excessively greedy eater

Ambivalence is a condition of having simultaneous conflicting beliefs or feelings towards some object.

Eccentric means having unconventional and slightly strange habit or behaviour.

Edible means fit to be eaten.

Elucidate means make (something) clear; explain.

Extremist means a person who holds extreme political or religious views, especially one who advocates illegal, violent, or other extreme action.

Delegate = entrust (a task or responsibility) to another person.

Cosmopolitan = familiar with and at ease in many different countries and cultures.

Credulous = having or showing too great a readiness to believe things.

Deteriorate = becoming progressively worse.

Thus option B is the right response.

Contemporaries are persons or things living or existing at the same time as another.

Legal is a term which describes law.

Convalescence is the gradual recovery of health and strength after illness or injury.

Diligent means having or showing care and conscientiousness in one's work or duties.

Lavarist is not a legitimate word.

Patient means able to accept or tolerate delays, problems, or suffering without becoming annoyed or anxious.

Fanatic is a person who is filled with excessive and single-minded zeal, especially for an extreme religious or political cause.

Neophyte is a person who is new to any subject or activity.

Freebie is a thing that is provided or given free of charge.

Intellectual = appealing to or requiring use of the intellect.

Mature = fully developed physically; full-grown.

Hence, option C is the correct response.

Catalogue means a complete list of items, typically one in alphabetical or other systematic order, in particular.

Portable means able to be easily carried or moved, especially because being of a lighter and smaller version than usual.

Honorary means conferred as an honour, without the usual requirements or functions.

Fatal means any incident or accident that leads to death.

Thus, option D is the correct answer.