The correct option is A adulthood
An abstract noun is a noun that cannot be seen or touched (it can only be experienced). It is an idea, quality or state.
Option
A is correct because 'adulthood' is an abstract noun: it refers to a
stage in life, a state of being completely developed.
Option B is
incorrect because 'barracuda' is a concrete noun, it is the name of a
fish and can be perceived through all the senses (sight, taste,
smell, etc.).
Option C is incorrect because 'drove' is a verb in the past tense.
Option D is incorrect because 'eye' is a concrete noun, it is a vital organ of a living being.