In this task, you are given a premise sentence, two possible options and a question word. If the question was cause you should select the option that is a possible cause of the premise sentence, and if the question word was effect you should find the option which is a possible effect of the premise sentence. Answer with "A" or "B".

[Q]: The bird couldn't fly. (A) It migrated for the winter. (B) It injured its wing., Question: cause
[A]: B


[Q]: The balloon expanded. (A) I blew into it. (B) I pricked it., Question: cause
[A]: A


[Q]: The boaters set off a flare. (A) Their boat drifted to shore. (B) Their boat was rescued., Question: effect
[A]:
B