Answer:
3. Alquilan.
Explanation:
Marta y Felipe alquilan un DVD.
The other ones are talking about just one person. This one refers to two people.
Dónde is a question word. (Interrogative). Ella- subject pronoun. Son- they are. Por- by
Are you supposed to answer the last one in past tense?
You need a dissertation that is in good condition and that is not copied from internet.
C.
Explication: I did this a week ago