For the given question above, I think there are choices or options accompanied with the questions. Here is what I got.
A. exocytosis
B. phagocytosis
C. diffusion
D. pinocytosis
E. receptor-mediated endocytosis
The answer is letter C. Diffusion.
Fertilization of the egg triggers the translation of the maternal bicoid mRNA into protein. The bicoid protein then diffuses through the egg forming a gradient.
I hope this answer helps.