Following the diagram of an ovum surrounded by few sperms :

Which of the following option is correct for the labelled parts $A, B$ and $C$?

$A$ $\quad$ $B$ $\quad$ $C$

The rate of cleavage is inversely proportional to the duration of

The yolk plug of gastrula represents in the later stage its

Sperm enters from which part of egg?

Of the following animals which produces the smallest egg