For the Data in the Source Table, What Is the Effect

Multiple Choice

For the data in the source table, what is the effect size for this one-way within-groups ANOVA? $$\begin{array} { | l | c | c c | c | } \hline \text { Source } & \text { SS } & d f & M S & F \\\hline \text { Between-groups } & 12.159 & 3 & 4.053 & 2.98 \\\hline \text { Subjects } & 6.77 & 5 & 1.354 & 0.996 \\\hline \text { Within-groups } & 20.4 & 15 & 1.360 & \\\hline \text { Total } & 39.329 & 23 & & \\\hline\end{array}$$

A) small
B) medium
C) large
D) very large