问题详情

Why is a long piece of string tied tightly round the neck of each bird？

A．Because it can prevent the birds from fighting against each other.

B．Because it can help the fishermen hold the birds tightly.

C．Because it can stop the birds from flying away from the ship.

D．Because it can keep the birds from eating the caught fish.

请帮忙给出正确答案和分析，谢谢！