复习一般将来时 will — 英语选择题

Tom正在制定周末计划。他说："I will visit my grandpa on Saturday. My sister won't go with me because she will have a piano lesson." 根据他的话，下面哪一项是正确的？ A. Tom's sister will visit grandpa with him. B. Tom will visit his grandpa on Saturday. C. Tom will have a piano lesson. D. Tom won't visit his grandpa.