When the birth rate is high, the expectation...

Câu hỏi: When the birth rate is high, the expectation of life is low.

A. The birth rate and the expectation of life are high and low respectively. 

B. The higher the birth rate is, the lower the expectation of life is. 

C. The birth rat is as high as the expectation of life. 

D. The high rate of giving birth dends on the low rate of expectation of life.