A Lethal Allele Causes Death, Frequently at an Early Developmental

Multiple Choice

A lethal allele causes death, frequently at an early developmental stage, and so one or more genotypes are missing from the progeny of a cross. Lethal alleles modify the ratio of progeny resulting from a cross.
-A cross between two green corn plants yields 2/3 progeny that are green and 1/3 progeny that are white. What is the genotype of the green progeny?

A) WW
B) Ww
C) ww
D) W_ (WW and Ww)