The Effect Size for the Data from an Independent-Measures T

Multiple Choice

The effect size for the data from an independent-measures t test can be measured by r²,which is the percentage of variance accounted for.Which of the following also produces the value for r²?

A) Squaring the Spearman correlation for the same data
B) Squaring the point-biserial correlation for the same data
C) Squaring the Pearson correlation for the same data
D) None of the other options will produce r².