The sentences containing Adjective Clauses are:

B. Sunil was the student who won the gold medal.

D. The stick that is in the corner belongs to Rishika.

Therefore, the correct answer is Option 4: B and D only.

The other sentences do not contain adjective clauses. Sentence A contains an adverb phrase ("rapidly"), sentence C contains a prepositional phrase ("of Benaras"), and sentence E contains an adverb phrase ("excessively").

Adjective clauses are dependent clauses that give information about nouns. They allow you to combine two sentences into one by using relative pronouns (​who, whom, whose, where, when, which, that, ​and ​why​) as connectors.

B. "Sunil was the student who won the gold medal."

• Adjective Clause: "who won the gold medal"
• Explanation: The adjective clause "who won the gold medal" describes or gives more information about the noun "student."

D. "The stick that is in the corner belongs to Rishika."

• Adjective Clause: "that is in the corner"
• Explanation: The adjective clause "that is in the corner" provides additional information about the noun "stick."