Which of the Following Best Describes the Number of Degrees $\begin{array}{|l|l|}\hline \text { A. } & 7 \\\hline \text { B. } & 8 \\\hline \text { C. } & 15 \\\hline \text { D. } & 10 \\\hline\end{array}$

Which of the following best describes the number of degrees of freedom used in a Chi-squared test of independence if there is a contingency table with 5 rows and 3 columns? $\begin{array}{|l|l|}\hline \text { A. } & 7 \\\hline \text { B. } & 8 \\\hline \text { C. } & 15 \\\hline \text { D. } & 10 \\\hline\end{array}$