What Would Happen If You Cultured a Frog Embryo Just

What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin?

A) The cells of the neural plate would elongate more than normal.
B) The cells of the neural plate would elongate much less than normal or not at all.
C) The cells of the neural plate elongate normally but do not become constricted as usually happens.
D) The cells of the neural plate elongate normally but become more constricted than they usually do.
E) The cells of the neural plate do not elongate and do not become constricted as they usually do.