\begin{tabular}{|l|l|}\hline 2. Eric needs to find the area of the base of a & 3. Wh \\ cylinder. Which formula should he use? & about \\ A. \( 2 \pi r \) & A. " \\ B. \( 2 \pi r h \) & B. " \\ C. \( \pi r^{2} \) & C. B \\ D. None of the above & D. \\ \hline\end{tabular}

To find the area of the base of a cylinder, we need to identify the correct formula from the options provided. 1. **Understanding the problem**: The base of a cylinder is a circle. The area \( A \) of a circle is given by the formula: \[ A = \pi r^2 \] where \( r \) is the radius of the circle. 2. **Analyzing the options**: - **Option A**: \( 2 \pi r \) - This is the formula for the circumference of a circle, not the area. - **Option B**: \( 2 \pi r h \) - This is the formula for the surface area of a cylinder, not the area of the base. - **Option C**: \( \pi r^{2} \) - This is the correct formula for the area of the base of a cylinder. - **Option D**: None of the above - This is incorrect since option C is valid. 3. **Conclusion**: The correct formula Eric should use to find the area of the base of the cylinder is: \[ \pi r^{2} \] Thus, the answer is **C. \( \pi r^{2} \)**.