The 55-Mph Speed Limit Was Introduced in the U

Multiple Choice

The 55-mph speed limit was introduced in the U.S. in 1973. Shortly thereafter the number of auto accidents declined. We can conclude that:​

A) ​the reduced speed limit caused the decline in auto accidents.
B) the reduced speed limit may have caused the decline in the number of auto accidents.​
C) the reduced speed limit and the number of auto accidents are causally related.​
D) the reduced speed limit had nothing to do with the decline in auto accidents.​