People Be Shouldn't Be Overly Worried About Asteroid Impacts

Multiple Choice

People be shouldn't be overly worried about asteroid impacts. Which of the following is NOT a reason why?

A) The incidence of large asteroid impacts is rare.
B) Risk, although relatively high, is averaged over thousands of years.
C) Scientists are working on methods to prevent possible asteroid impacts.
D) The Earth's atmosphere will vaporize all asteroids before they reach the ground.