Read the excerpt and answer the question. Of the 1000 bicycling deaths each year, three-fourths are caused by head injuries.
Half of those killed are school children. Studies conclude that wearing a bike helmet
can reduce the risk of head injury by 85 percent. In an accident, a bike helmet
absorbs the shock and cushions the head.

Excerpt from ""Bike Helmets: Unused Lifesavers," Consumer Reports (May 1990):
348.

What is the central idea of this passage?

A:Cause of bicycling deaths
B:Children's head injuries
C:Dangers of head injuries
D: Why head iniuries?

explain answer