What would you say if you want to compliment a friend on his or her good game? (1 point) sabes a jugar. sé jugar muy bien. sabes jugar muy bien. sabes al jugar bien.

If you want to congratulate a friend for his or her performance in a game, you would fisrstly talk to him or her using the 2nd person in singular (informal) you, and then express how good that person played.

It would be something like:

You know how to play very well

Which in Spanish is:

Tú sabes jugar muy bien

Nevertheless, it is important to note that in Spanish is not always necessary that the subject is explicitly in the sentence, it is called Tacit Subject, Implicit Subject or Null Subject.  

This is because the subject is encoded in the verb conjugation. So, another good option is:

b is your answer. you're welcome : )