Answer: A, B, D
Step-by-step explanation:
This type of clauses are usually starting with the relative pronouns and that is why they are called relative clauses. Those relative pronouns are such as, who, which, whose, that, where or when.
Those pronouns are used in the sentences when they have to identify the noun.
A) In this sentence the relative clause is having a relative pronoun - WHICH
B) This sentence is having a relative pronoun - THAT
D) And this one has relative pronoun - WHO
Answers C and E are not in relative clause because they don't have this kind of pronoun in them