In the following question, a sentence is given with a

Solution

The sentence defines neuroplasticity as a feature of the brain that enables it to change its own structure and functioning in response to activity and mental experience. Option (b) is incorrect because 'characteristics' is plural and the subject it corresponds to, i.e. neuroplasticity is singular. 'Hallmarking' is incorrect because it is verb and should be replaced by a noun instead; also, 'properly' is an adverb; option a) is eliminated. 'Allocate' which means distribute (resources or duties) for a particular purpose, does not give out the intended meaning of the sentence, as mentioned above. Hence, (e) is the correct answer because the boldened phrase makes the sentence grammatically correct and gives the intended meaning.