Hemophilia has been identified as a X linked recessive trait. If a man with hemophilia (Xh, Y) has children with a woman who is a carrier of the trait (X, Xh) but does not have it herself..What is the probability that their children will suffer from hemophilia?

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).