A is right!
Could you tell me where I can get the book? Or Could you tell me where to get the book?
Could you tell me how I can get there? OR Could you tell me how to get there?
I don't know what I should do. OR I don't know what to do?
That's the grammar rule!
肯定是A啦，for后面要动名词，to后加动词不定式
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