I know it's hard to say goodbye. So why_____________ choose to s

I know it's hard to say goodbye. So why_____________ choose to stay?
A、 not to
B、 not
C、 to
D、 /
【正确答案】：B
【题目解析】：该题考查的是不定式的用法。在why no句型中，后面加不带to的不等式，不加to。