【单选题】Every day 25 million US children ride school buses. The safety record for these buses is much better than for passenger cars; but nevertheless, about 10 children are killed each year riding on large s...
A.
School buses killed the smallest number of children in America.
B.
School buses are much safer than passenger cars in America.
C.
Outside buses in loading zones killed the most children in America.
D.
Children in America mainly take school buses to and from school.