If the Sample Mean Difference Is 3 Points,which of the Following

Multiple Choice

If the sample mean difference is 3 points,which of the following sets of data would produce the largest value for Cohen's d?​

A) ​n = 10 for both samples and a pooled variance of 15
B) ​n = 20 for both samples and a pooled variance of 15
C) ​n = 30 for both samples and a pooled variance of 15
D) ​Cohen's d is the same for all three of the samples.