In Birds,sex Is Determined by a ZW Chromosome Scheme That

In birds,sex is determined by a ZW chromosome scheme that is much like the typical XY scheme seen in humans and many other organisms,except that the system is reversed: Males are ZZ (similar to XX in humans) and females are ZW (similar to XY in humans) .A lethal recessive allele that causes death of the embryo occurs on the Z chromosome in pigeons.What would be the sex ratio in the offspring of a cross between a male heterozygous for the lethal allele and a normal female?

A) 1:1 male to female
B) 4:3 male to female
C) 3:1 male to female
D) 1:2 male to female
E) 2:1 male to female