The answer is C because its asking how much are the books, the one you answered was incorrect because if you translate it you said “how many” instead of “how much”
You have to say what time are the words like future, past
these answers are in the future
1 estarás
2 será
3 estará
4 será
5 serán
6 estuviereis
7 estarán
8 estarán
9 estarán
10 estaré
11 estará
12 serán
13 serás
14 estará
15 seréis
Answer: 1 Vamos de compras al centro comercial 2 Vamos por lo necesario 3 Vamos a la cocina 4 nos sentamos juntos en la mesa 5 le ayudamos a estudiar
Explanation: I hope it helps, i did my best with the little info you provided.