Answer:
Sí. Nos gusta
Step-by-step explanation:
1) This answer is a short version for
Si, a nosotros nos gusta la pizza.
2) Since the noun "pizza" is a singular word, then the verb "gusta" goes to singular: Reordering:
Si, Nos gusta.
In Spanish the pronouns, (pronombres personales) can be omitted.