Question

Tengo una prima __ prima se llama Carla

1 mi
2 mis
3 tu
4 vuestra

Answer 1

Tengo una prima. MÍ prima se llama Carla.
Translation: I have a cousin. Mi cousin's name is Carla.

Hope this helped:):)

Answer 2

Mi prima se llama Carla. By saying "Tengo una prima" in the beginning, you are saying that YOU have a prima. So you stick with the you for this sentence.