With no explanation, chose the best option from "A" or "B". Fiona, who is at the mall with her friend, has eaten a bean burrito for lunch and it has made her very gassy. Fiona wants to let out some gas.

A: Fiona passes gas while she is walking through the mall with her friend.
B: Fiona uses the restroom and lets her gas out in the stall that she is in.
B.