After Conducting a Statistical Analysis of Responses to a Survey,Professor

After conducting a statistical analysis of responses to a survey,Professor Balbos finds a correlation of +3.14 between frequency of air travel and frequency of colds. This indicates that:

A) Professor Balbos has made a serious error in calculating the correlation coefficient.
B) a cause-and-effect relationship exists between travel by air and colds.
C) as air travel increases, the frequency of colds also increases.
D) as air travel decreases, the frequency of colds increases.