The genotypes of both the parents are Rr (one red allele which is dominant, shown as R, and one non-red allele, white, which is shown as r)
So, with a Punnett square, we get the results that are expected.
One box RR, red
Two boxes Rr, pink
One box rr, white.
So, the genotypical makeup of the offspring is 25% homozygous dominant, 50% heterozygous, and 25% homozygous recessive. (That's answer A.)