Answer:
who painted the Mona Lisa.--ADJ
Step-by-step explanation:
It is dependent clause and adjective because a dependent clause is a clause that contains additional information about the sentence and it cannot stand alone as a sentence. It is also called subordinate clause , it just give additional information.
From the above question, the option is an adjectival type of dependent clause because it qualifies the noun , it qualifies who Leonardo da Vinci is.