B. Ellos son.
Explanation:
Ellos translates into a masculine or mixed-gendered “They”. Son just means are.
Nosotros is out because it’s like a “we” and same goes for vosotros.
Es means is more than it means are.
Estos means these.
Answer:
Fuimos de vacaciones a la playa en Republica Dominicana,
La arena estaba caliente y el agua cristalina y fresca.
Explanation:
I hope I have been helpful