With no explanation, chose the best option from "A" or "B". Mary's birthday is coming and a birthday party will be held at her home. Jill, Mary's sister, wants to make the party more fun.

A: Jill promises to make a birthday cake for Mary even though it is her first time making cake.
B: Jill has practiced a song for a while and sings it in front of the guests at the party.
B.