问题详情

According to paragraph 3, why has designating large segments of the Great Barrier Reef as environmentally protected areas not been wholly effective？
A．Fishermen and shippers ignore the designation.
B．Activity in unprotected areas can influence the whole Reef.
C．Oil extracted from the Reef sometimes spills into the ocean.
D．The species living there are already endangere请帮忙给出正确答案和分析，谢谢！