How Can an Organism Like C

How can an organism like C. elegans, which follows an invariant pattern of mitosis, develop different cell types in a dividing zygote?

A) The mother deposits different transcription factors in different parts of the egg.
B) The dividing cells communicate with each other to determine their fate.
C) Gravity influences cells differently depending on their position in the zygote.
D) Different cell types cannot arise from an invariant pattern of mitosis.