Select the most appropriate form of comparative degree that can substitute the highlighted segment in the given sentence.
Bilingual children are so intelligent than those who speak just one language.

Correct option is D

The correct answer is "(d) more intelligent than."
· Explanation:
· The phrase "so intelligent than" is incorrect.
· The correct phrase should be "more intelligent than" when comparing two things.
· Correct "Bilingual children are more intelligent than those who speak just one language."
· Meanings of Other Options:
· (a) better intelligent than (wrong) – Incorrect phrase structure.
· (b) so intelligent to (wrong) – Incorrect preposition usage.
· (c) the most intelligent to (wrong) – "Most" is used for superlative comparison, not comparative.
Thus, option (d) "more intelligent than" is correct.