Choose the sentence which has an Adjective Clause:-

He is the man whom we all respect.

The correct answer is Option (3) → He is the man whom we all respect.

Here's why:

What he said, was true.This is a complex sentence with a dependent clause, but it's not an adjective clause. The dependent clause "what he said" acts as a noun clause (subject of the verb "was").

Life is what we make it. - This is a simple sentence with a relative pronoun ("what"), but it doesn't introduce an adjective clause. "What" functions as the direct object of the verb "is."

He is the man whom we all respect. - This sentence has an adjective clause "whom we all respect." It describes the noun "man" by providing more information about him (someone we respect). "Whom" is the relative pronoun connecting the clause to the noun.

They can stay where they are. - This is a complex sentence with an adverbial clause ("where they are"), not an adjective clause. The adverbial clause modifies the verb "can stay" by indicating location.