主要是记住can't help后面接词用法：
can’t help doing sth．和can’t help but do sth 表示“不得不、禁不住做某事”,
We couldn't help laughing when we heard the funny story.
can’t help to do sth．表示“不能帮助做某事”,
I can't help (to) wash the dishes because I am busy preparing for the entrance exams.
很明显这里是不能帮助做家务.故选择B
to do不定式表示将要做,结合语境是有很多事情将要做,我不知道是否有时间出去.故选择B
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