Which Statement Concerning Secondhand Smoke Is True

Which statement concerning secondhand smoke is true?

A) There is no evidence that secondhand smoke leads to any health problems
B) Hundreds of thousands of children suffer from lung problems annually from secondhand smoke each year
C) Less than one-fifth of Americans have been exposed to secondhand smoke
D) Nonsmokers exposed to secondhand smoke are more likely to die from lung cancer than from cardiovascular disease