The correct response is:
the volume of the prism is 3 times the size of the volume of the pyramid.
The volume of a prism can be calculated using the formula:
\[ V_{\text{prism}} = B \cdot h \]
where \(B\) is the area of the base and \(h\) is the height.
The volume of a pyramid is calculated using the formula:
\[ V_{\text{pyramid}} = \frac{1}{3} B \cdot h \]
So, if they have congruent triangular bases and the same height, the volume of the prism will be three times that of the pyramid. Therefore, the relationship between the volumes is:
\[ V_{\text{prism}} = 3 \cdot V_{\text{pyramid}} \]