Read this sentence:
Students gave apples to their teachers in the old days. This was a sign of appreciation.
How can this sentence be rewritten so it is clearer?
A. As a sign of appreciation, students gave apples to their teachers in the old days.
B. Because students gave apples to their teachers in the old days, it was a sign of appreciation.
C. Students gave apples to their teachers in the old days, and this was a sign of appreciation.