Answers A and C are correct. The sporophyte produces haploid spores by meiosis. The sporophyte is haploid as a seedling and diploid as a sexual adult. The gametophyte is diploid and produces gametes by meiosis. The diploid zygote develops into the gametophyte.
Dimples are an autosomal dominant trait.
A man with dimples marries a woman without dimples. They have three children with dimples and two children without dimples. The father is Dd and the mother is dd. The offspring of any mating or cross are the P1 generation. Crossing an F1 with a parental genotype produces true breeding offspring.