Answer C is correct. Homologous chromosomes do pair with each other by synapsis to form tetrads, at the start of Meiosis 1.
Answer A is not correct because homologous chromosomes are inherited from both parents, e.g., chromosome 4 from your mother’s egg and chromosome 4 from your father’s sperm are a pair of homologous chromosomes. Most of the time, homologues (homologs) do not physically line up with each other as a pair; that happens only at the start of meiosis 1, to ensure that each gamete receives only one copy of each pair. The rest of the time, the members of each pair are not necessarily near their partners within the nucleus of the cell.
Answer B is incorrect because chromosomes do not duplicate themselves to make sister chromatids all the time, only before each round of mitosis cell division. During interphase, chromosomes are long, single DNA strands containing genes that produce their various gene products.
