Answer:
B. sepamos
Explanation:
We know that the answer must be in the nosotros form because of the use of "vamos" later in the sentence. Using this context, we can conclude that the entire sentence is using "nosotros", and the nosotros form of saber is sepamos.
It doubles
Indo-European languages or
Lenguas indoeuropeas
I can help but how do you fill it out??