Choose the sentence with the adjective clause :- (A) I am as tall as…

The correct answer is Option (3) → (B) Only

An adjective is a word that describes a noun or a pronoun, for example a tall tree, the food is tasty.

Adjective clause:

• An adjective clause describes a noun, as an adjective does.
• It usually begins with a relative pronoun: who, whom, whose, which, that.
• It comes right after the noun it describes.
  Example: The girl who won the race is my cousin.

(A) I am as tall as you are. — Incorrect.

• "As you are" is an adverb clause of comparison.
• It tells how tall, not which person.

(B) I know the man who built that house. — Correct.

• "Who built that house" describes the noun man: it is an adjective clause.

(C) you say more than you mean. — Incorrect.

• "Than you mean" is an adverb clause of comparison.

(D) He eats as much as he can. — Incorrect.

• "As he can" is an adverb clause of comparison (degree).
• It describes no noun.

Tip: In this question the options do not follow the order of the statements (Option 1 = (C) Only, Option 2 = (A) Only, Option 3 = (B) Only, Option 4 = (D) Only). NTA often jumbles the options in this way, so after finding the correct statement, read the options carefully and mark the one with the right letter.