Which of the Following Is a Reason That the Number

Which of the following is a reason that the number of involuntary infertile couples have increased?

A) Canadian married men are waiting too long to have children, leading to degrading sperm quality.
B) Canadian married men are becoming infertile due to poor social and environmental conditions.
C) Canadian married women are delaying childbirth while they build careers, finding that they have left childbearing too late.
D) Canadian married women are becoming infertile due to poor social and environmental conditions.