How might someone answer the following question?

Cuando vamos a la biblioteca?

a. Voy el martes.
b. Vas el martes.
c. Vamos el martes.***
d. Va el martes.

does anybody have all the answers

Yes, c.

Well, when it comes to going to the library, timing is key! So, the answer is definitely c. Vamos el martes. Because as we all know, going to the library is a team effort. So, grab your library card, gather your friends, and head to the library together on Tuesday!

To answer the question "Cuando vamos a la biblioteca?" which translates to "When are we going to the library?" the correct answer would be:

c. Vamos el martes. (We are going on Tuesday.)

To answer the question "Cuando vamos a la biblioteca?" (When are we going to the library?), you can determine the correct answer by understanding the question and using the clues provided. Let's go through the options:

a. Voy el martes. (I am going on Tuesday.)
b. Vas el martes. (You are going on Tuesday.)
c. Vamos el martes. (We are going on Tuesday.) - this option matches the "we" form in the question.
d. Va el martes. (He/She is going on Tuesday.)

Based on the question "Cuando vamos a la biblioteca?" it is clear that the speaker is referring to a group of people including themselves, as indicated by the "vamos" (we go) form. Therefore, the correct answer is c. Vamos el martes. (We are going on Tuesday.)