Males Are Less Likely to Survive Than Females,both Before and After

Multiple Choice

Males are less likely to survive than females,both before and after birth.One important reason is that

A) males have more dominant,defective alleles than females.
B) males are more vulnerable to disorders caused by X-linked recessive alleles than females.
C) males have two Y chromosomes.
D) most societies value males less than females and provide males with less protection.