Choose the correct alternative which will improve the part of the sentence given in quotes:
Some children are much more 'aggressive then' others.

Correct option is B

The correct option is (b) Aggressive than.
Error identification: The word "then" is incorrect here; it should be "than" because it is used for comparisons.
Grammatical Rule used: "Than" is used in comparative sentences, while "then" refers to time.
Corrected sentence: Some children are much more aggressive than others.
Example: She is smarter than her brother.
Meanings of other options:
Aggressively than: Incorrect adverb form.
Aggressively then: Incorrect comparative structure.
No improvement: Not applicable.