Solutions
Hunger relates to satiety or satisfaction. The need for power is something which is never satisfied. Hence, we go with 'insatiable' and 'contain'. Option D is the correct answer.
Contain means restrain
Accumulative means gathering or growing by gradual increases.
Subsume means to include or absorb (something) in something else.
Enormous means very large in size, quantity, or extent.
Empowering means to give (someone) the authority or power to do something.
Delegate means to entrust (a task or responsibility) to another person, typically one who is less senior than oneself.
Evolutionary means relating to the gradual development of something.
Rationalize means to attempt to explain or justify (behaviour or an attitude) with logical reasons, even if these are not appropriate.