Respuesta :
I am assuming that the underlined phrase in this circumstance is "which belongs to my sister." This would be an adjective clause. Because it modifies a noun, "the car," it functions as an adjective. It adds further description to the sentence. Adjective clauses modify nouns while adverb clauses modify adverbs, verbs, or adjectives. Hope this helps.
Answer:
Adjective Clause
The car which belongs to my sister is being towed.
Explanation:
Adverb Clause-a clause that functions as an adverb in a sentence. It always starts with a subordinating conjunction.
Example: Even if I take the test, my grades won't change.
Noun Clause-a clause that acts as a noun.
For example, I am not interested in whatever Anthony says.
Adjective Clause-a clause that is used to describe a noun in a sentence.
For example, the guy who claimed to be a genius didn't even make it to the top list.