The amount of yolk and its distribution in the egg will affect ______.

The correct option is B pattern of cleavage
The zygote undergoes mitotic divisions called cleavage and develops into an embryo.

The pattern of cleavage is determined by the amount of yolk and its distribution in the egg.

If the egg is having moderate to sparse amounts of yolk then the egg divides completely and this type of cleavage is called holoblastic cleavage.

If the egg contains a large amount of yolk then the egg cannot divide completely as the cleavage furrow cannot penetrate the yolk. This type of cleavage is called meroblastic cleavage.

The rest of the options given are not affected by the amount of yolk in the egg and its distribution.