Why does the student mention Professor Connellys class？A．She was not happy with the grade

Why does the student mention Professor Connellys class？

A．She was not happy with the grade she received in the class.

B．She might be able to expand the research she did in the class.

C．It was the most difficult class she ever took.

D．Professor Connelly took the class on a trip to Venezuela.

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！