The cultured human cell line HeLa expresses the E6 and E7 proteins of human papillomavirus.What would happen to these cells if the expression of these proteins was shut off?

A) They would continue to grow at their usual pace
B) They would continue to grow, just more slowly.
C) They enter the G₀ phase of the cell cycle.
D) They go into apoptosis and die.
E) They become even more tumorigenic.