题目内容：
Maybe ten-year-old Elizabeth put it best when she said to her father, "But, Dad, you can't behealthy if you're dead. " Dad, in a hurry to get home before dark so he could go for a run, had forgotten to wear his safetybelt--a mistake 75% of the US population make every day. The big question is why.
There have been many myths about safety belts ever since their first appearance in cars someforty years ago. The following are three of the most common.
Myth Number One:It's best to be "thrown clear" of a serious accident.
Truth :Sorry,but any accident serious enough to "throw you clear" is also going to be seriousenough to give you a very bad landing. And chances are you'll have travelled through a windshield(挡风玻璃) or door to do it. Studies show that chances of dying after a car accident are twenty-fivetimes greater in cases where people are "thrown clear. "
Myth Number Two:Safety belts "trap" people in cars that are burning or sinking in water.
Truth:Sony again, but studies show that people knocked unconscious(昏迷) due to not wearingsafety belts have a greater chance of dying in these accidents. People wearing safety belts are usuallyprotected to the point of having a clear head to free themselves from such dangerous situation, not tobe trapped in them.
Myth Number Three:Safety belts aren't needed at speeds of less than 30 miles per hour(mph).
Truth:When two cars travelling at 30 mph hit each other, an unbelted driver would meet thewindshield with a force equal to diving headfirst into the ground from a height of 10 meters.
根据以上内容,回答题.
（ ） Why did Elizabeth say to her father, "But, Dad, you can't he healthy if you're dead"? A．He was driving at great speed.
B．He was running across the street.
C．He didn't have his safety belt on.
D．He didn't take his medicine on time.
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