The teacher has done his best to help all students. However, none of them made any effort on their part.
A. The teacher has done his best to help all students, then, none of them made any effort on their part
B. Although the teacher has done his best to help all students, none of them made any effort on their part
C. Because the teacher has done his best to help all students, none of them made any effort on their part
D. If the teacher has done his best to help all students, none of them made any effort on their part
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