What Happened in the Experiments Where Cytochalasin Was Added to a Developing

What happened in the experiments where cytochalasin was added to a developing neural plate?

A) Cytochalasin had no effect on microfilament growth or invagination of the ectoderm.
B) Microfilament growth was enhanced and invagination of the ectoderm did not result.
C) Microfilament growth was impaired and invagination of the ectoderm resulted.
D) Microfilament growth was impaired and invagination of the ectoderm did not result.