The answer is A: predict.
Multiple choice questions tend to be intricate and, in most cases, at least two of the options are either semantically or meaningfully very close, so that choosing between them is the real test —if one can choose the right answer from those two options that are so close to each other, and amongst all options in general, then the student proves he or she has grasped the sense of the question. That is why, predicting the answer can assist the student in choosing the right answer by either confirming his prediction or testing it in order to come up with the right option.
I think it would be answer D, to introduce an idea because it's introducing the idea of a Venus Fly Trap's diet.
