Detailed Instructions: 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 man made an error in his calculations. (A) He checked his work. (B) His work was hasty., Question: cause
A:
B