The Fact That the Onset of Autism Symptoms Typically Occur

The fact that the onset of autism symptoms typically occur at about the same age children receive many of their vaccinations,including the MMR,is an example of

A) an observed correlation but not necessarily evidence of a cause-and-effect relationship.
B) an observed correlation and strong evidence of a cause-and-effect relationship.
C) an observed and evidentially supported cause-and-effect relationship.
D) an observed cause-and-effect relationship but not necessarily a correlation.