$A$ sperm without an acrosome cannot

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:

Name the cells which provide nourishment to the spermatogonia.

Given a diagram showing a portion of a seminiferous tubule. Identify the marked alphabets.

Males in whom testes fail to descend into the scrotum are generally infertile. Why?

Arrange the stages of human spermatogenesis in the correct sequence.