The correct option is B size and volume
In testes, the immature male germ cells, spermatogonia (singular: spermatogonium) undergo mitosis and form primary spermatocytes.
The primary spermatocytes accumulate a large amount of nutrients and increase in size. Therefore, primary spermatocyte differs from the spermatogonium in terms of size and volume.
Spermatogonium has the same number of chromosomes as that of the primary spermatocyte because spermatogonium has undergone mitotic division to form the primary spermatocyte.
The DNA content and the size of the chromosomes will be same in the spermatogonium as well as in the primary spermatocyte if the species remains the same.