We were trying to think of what to do when Sarah suggested we go to her pool . Her pool had a slide , 2 diving boards , and were really deep . I did n't think my mom was going to let me go but she did supprisingly .

Generate a question about the above context.
Why was the narrator happy to go to Sarah 's ?
Pick from:
(A). Sarah has a cool mom .;
(B). Sarah has a cool gym .;
(C). None of the above choices .;
(D). The narrator was n't expecting to get to go .;