Talking about beans and rice

Let's look at the meaning of each option first:

Won't fall: I shouldn't fall, but I did. Here, the author didn't say whether I should or not, just assumed that if I didn't, what would happen now? ...

You Shouldn't fall: you shouldn't fall (it happened in the past, so use should. You can't tell from this sentence whether it fell)

Not yet fallen: the past perfect tense indicates that the past is over. Today's things have ended and become the past; Falling in love was before today, the past is the past, and the action is over, so use the past perfect tense.

From the perspective of phrase collocation, to is not used in phrases; In addition, the use of were in virtual clauses is an assumption of impossibility.

After the above analysis, combined with the meaning of the sentence, I think cocoa bean rice should be able to understand why the answer is C?