The correct option is A Homologous chromosomes separate
During anaphase I, from each tetrad, two chromatids of a chromosome move
as a unit (dyad) to one pole of a spindle, and the remaining two
chromatids of its homologus migrate to the opposite pole. Thus, the
homologous chromosomes of each pair, rather than the chromatids of a
chromosome, are separated. As a result, half of the chromosomes, which
appear in early prophase, go to each pole. It is here in the anaphase I
that the real reduction in the number of chromosomes occurs.
So, the correct answer is 'Homologous chromosomes separate'.