Your best friend meets you at the local library where you are sitting with several open notepads in front of you. What can he say to you? ¿Te gusta escribir?
¿Te gustan escribir?
¿Te gusta hablar?
¿Te gustan hablar?

Te gusta escribir?

Explanation:

This is because escribir means "to write". Te gusta means "do you like"

Therefore:

We can't pick gustan because it is the plural form of gusta... we would've then said "do you like to write them"

We can't pick anything with hablar because it means "to speak", which doesn't make sense for the given scenario

i think it's b, lmk if it was