If a red cow (homozygous dominant ) is crossed with a white cow (homozygous dominant ) , what alleles will the offspring have

Assuming you actually meant homozygous dominant for the white cow, the alleles of the offspring would be:

RW

Where R stands for the allele that codes for the color red and W stands for the allele that codes for the color white.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.