Martin Has Found a Correlation of R

Multiple Choice

Martin has found a correlation of r ? .18 between the two variables of caffeine consumption and frontal lobe activity.This correlation is more likely to be statistically significant if:

A) The study can be applied to the real world
B) Martin used a larger number of subjects
C) Martin measured frontal lobe activity extremely accurately
D) Martin's measure of caffeine consumption is categorical
E) Martin's study is based on a random sample