Creo que la respuesta es
B. Las muñecas
Pero por favor sea más específico con la pregunta.
It wold be 1. Queria llamarte
C. Prefieren is correct because it is THEY prefer it
A is wrong because preferimos includes you
B is wrong because its not one person if not the question would be El not Ellos
D is wrong because you don't prefer that sport
1. cocina una hamburguesa para ellos.
2. comprale un auto a el.
3. escribe una carta para el.
4. limpiale el pelo a el.
hope this helps!