Question

which of the following increases the chance of cancer? i exposure to certain chemicals ii exposure to certain types of radiation iii the consumption of too many vitamins iv sleep deprivation a. i, ii, and iv only b. iii and iv only c. i, ii, iii and iv d. i and ii only

Explanation:

接触某些化学物质和特定类型的辐射会损害细胞的DNA，增加患癌风险。睡眠剥夺可能影响免疫系统等，也与癌症风险上升相关。而过多摄入维生素一般不会直接增加患癌几率。

Answer:

A. I, II, and IV only