Question

the majority of cancers are caused by

a sedentary lifestyle.

genetic factors.

bacterial infections.

contact with a person who has cancer.

chemical exposure or other environmental factors.

Explanation:

• A sedentary lifestyle is a risk factor but not the main cause for most cancers.
• Genetic factors cause a minority of cancers (around 5 - 10%).
• Bacterial infections cause only specific cancers (e.g., H. pylori for gastric cancer), not the majority.
• Cancer is not contagious, so contact with a cancer patient does not cause cancer.
• Chemical exposure (e.g., carcinogens in environment, diet, workplace) and other environmental factors (like UV radiation) are responsible for the majority of cancer cases, along with lifestyle - related factors that fall under environmental influences in a broad sense.

Answer:

chemical exposure or other environmental factors.