In the testis,the immature germ cells produce sperm by $...A...$ at puberty. $...B...$ present on the inside wall of seminiferous tubules multiply by $...C...$ division and increase their number. Identify $A$,$B$,and $C$ from the above statement.

• A
  $A-$secondary spermatocytes,$B-$primary spermatocytes,$C-$mitosis
• B
  $A-$primary spermatocytes,$B-$secondary spermatocytes,$C-$mitosis
• C
  $A-$spermatogenesis,$B-$spermatogonia,$C-$mitosis
• D
  $A-$spermatogonia,$B-$spermatogenesis,$C-$meiosis