Which is a primary risk factor for developing cancer? a. active immune systemb. lack of iron in the dietc. lack of calcium in the dietd. workplace exposure

D. Workplace exposure

The workplace exposure is a primary risk factor for developing cancer. Chemical workers, X-ray technicians, ionizing radiation researchers and asbestos workers are those people who work and are exposed to cancer-causing agents. They must follow all safety precautions and as much as possible, minimize any exposure to such compounds.  

answer; i do believe the correct answer is (25) times faster;

a1 = unhealthy

a2= healthy

a3= healthy