Question: Stem cells are cells that can differentiate into many different kinds of cells. Scientists have discovered that the environment supporting the cells influences stem-cell differentiation. For example, stem cells grown on strong, flexible surfaces became muscle cells. What most likely happened to stem cells grown on a hard, rigid surface?

  Options: 
 A. They became nerve cells.
 B. They became red blood cells.
 C. They became bone cells.
 D. They became skin cells.
Answer: C