A colour blind man marries a daughter of a colour blind father. What will be the colour blindness status of the generation?

Correct option is D. half sons will be colourblind
Daughter of a color blind father will be a carrier for the trait, as a female has two X chromosomes; genotypically she will be a heterozygous carrier and will be phenotypically normal. If married to a color blind male. The female progenies will be Normal:carrier in a ratio of 1:1. While, the male progenies will be colorblind:normal in a ratio of 1:1. So, the correct answer is 'half sons will be colourblind'