What is the correct shape and length of the human testis?

Given below is a diagram of the $T.S.$ of a testis. Select the option which gives the correct identification of the function of cells labeled $A, B, C,$ and $D$ from the options given below.
$A$ - cells undergo spermatogenesis to produce spermatozoa.
$B$ - cell responsible for the development of male secondary sexual characters.
$C$ - heads of sperms remain attached to these cells.
$D$ - haploid male gamete.

Most mammals have a testis sac called the scrotal sac,which is for:

In humans and rabbits,the scrotum is connected to the abdominal cavity by which of the following?

$A$: The male urethra is longer than the female urethra.
$R$: It carries both urine as well as semen.

Draw a labeled diagram of the male reproductive system.