If '→' denotes increasing order of intensity, then the meaning of the words [dry → arid → parched] is analogous to [diet → fast → ________ ]. Which one of the given options is appropriate to fill the blank?

The given sequence represents increasing degrees or intensity of a state of lack of moisture:

• dry: slightly or moderately lacking moisture

• arid: having very little or no rain; extremely dry

• parched: extremely dry or severely dehydrated

Similarly, for the restriction/absence of food:

• diet: regulating or limiting food intake for health or fitness

• fast: abstaining from all or some kinds of food/drink for a specific period

• starve: suffering severely or dying from extreme hunger/lack of food

Thus, starve represents the highest intensity in this sequence.

Hence, A is the correct option.