According to the professor, what is a common reason for migration that does NOT apply to b

According to the professor, what is a common reason for migration that does NOT apply to baleen whales？

A．The need to avoid lower water temperatures

B．The need to raise young in a suitable environment

C．The need to find better feeding grounds

D．The need to find a mating partner

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！