Within the Human Body, Different Cells Have Different Characteristics or Phenotypes

Multiple Choice

Within the human body, different cells have different characteristics or phenotypes. For example, neurons look and behave very differently from hepatocytes (liver cells) . How can this be explained considering that all cells within a person were derived from the same starting cell?

A) Each cell type within a person must contain different genes.
B) Each cell type within a person must contain different proteins.
C) Each cell type within a person must contain different alleles for specific genes.
D) Each cell type within a person must undergo continuous variation.