Which statement BEST explains exposure to a carcinogen could lead to cancer? (a).If the carcinogen causes the cell to pause the cell cycle, it could remain in a stable state until the end of its life. (b).If the carcinogen causes the cell to undergo programmed cell death, it could cause that tissue to have one less cell contributing to the function of an organ. (c).If the carcinogen causes a mutation in a gene that regulates the cell cycle, the cell could show unregulated growth and division. (d).If the carcinogen causes a mutation in a gene for a cell membrane protein, the cell could increase the rate of diffusion across the membrane.