Joke Collection Website - Bulletin headlines - How to do this, please? Explain, thank you

How to do this, please? Explain, thank you

The answer is C.

The ambiguity of A is whether Xiao An has only one hand carrying the bag or both hands carrying the bag.

B's ambiguity is whether Xiao Wu draws slogans on the train or sits on the train to write slogans.

D's ambiguity is that Khufu is very happy to see us, or we are very happy to see us.