In humans, at the end of the first meiotic division, the male germ cells differentiate into the

A single ejaculation contains $…A…$ to$…B..$. million spermatozoa. Semen has pH of $…C…$ to $…D….$ Its alkalinity helps to neutralize the acidity of urethra. Here $A,B, C$ and $D$ refers to

Spermatogonia formed after which cell division

Extrusion of second polar body from egg nucleus occurs 

Given below are two statements :

Statement $I$ :

The release of sperms into the seminiferous tubules

is called spermiation.

Statement $II$ :

Spermiogenesis is the process of formation of sperms from spermatogonia.

In the light of the above statements, choose the most appropriate answer from the options given below: