Since the subject is "tú y tus amigos" it is the same thing as "ustedes." That is a. (you-all meet)
b. I meet
c. you (singular/familiar) meet
d. we meet
Sra
The correct answer in Spanish would be "a. se encuentran". So the full sentence in Spanish would be "¿Cuándo se encuentran tú y tus amigos? Después de las clases o los fines de semana." This translates to "When do you and your friends meet? After school or on the weekends."
