Which one of the following statements is TRUE regarding the G₀ phase of the cell cycle?

A) G₀ is an abnormal state, and cells in this stage have been damaged.
B) Neurons and osteocytes remain in G₀ after adolescence.
C) Most cancer cells have entered the G₀ phase.
D) Once in G₀, a cell remains there.
E) Stems cells in the bone marrow are typically in the G₀ phase.