Answer
D.
Work Step by Step
Homologous chromosomes are the two copies of the same chromosome, say a woman's two X chromosomes, which came, one each, from parents. They are whole, not half, so A. is wrong, and B. can be excluded because they are neither identical nor from the same parent. C. is wrong since homologous chromosomes are not identical, just very similar, since they come from different sources.
