A Study Shows That People Who Chew Bubble Gum Have

Multiple Choice

A study shows that people who chew bubble gum have more cavities. Which criteria of casual inference does this example show?

A) The two variables are not correlated.
B) Multiple alternative explanations exist for the correlation.
C) The presumed cause precedes the presumed effect in time.
D) The study was conducted in an open environment.
E) The sample size is large enough.