What Experimental Result Demonstrates the Concept of Self-Regulation

Multiple Choice

What experimental result demonstrates the concept of self-regulation?

A) Killing one cell in a two-cell embryo results in half an embryo.
B) Killing one cell in a developing C. elegans results in a worm with one less cell than normal.
C) Scooping out a clump of cells from a blastula results in a neurula with a chunk missing.
D) Surgically removing a chick limb bud causes remaining nearby cells to create a new one.