Answer:
The answer to your question would be that A, B and D contain relative clauses.
Step-by-step explanation:
Relative clauses can either be restrictive or nonrestrictive depending on the information they provide. B and D contain restrictive relative clauses because the information provided by these modifiers is necessary to identify the noun they refer to. If the clauses were removed, the meaning of the sentence would be altered (see 1 and 2). On the contrary, A contains a nonrestrictive relative clause because the information the clause provides is not relevant to the meaning of the sentence; in fact, it could be dropped without changing the meaning of the sentence (see 3).
1. # The bicycle is still in great shape (not the same as the original sentence)
2. #Sierra met the boy (not the same as the original one)
3. The car is parked in the garage