2. (8 points) A cake with a radius of 20 cm can feed 4 people. If the radius increases by 150%, a cake of the same height can feed ( ) people.
A. 9
B. 15
C. 16
D. 25
【Solution】Solution: The radius is $1+150\%$ of the original,
the base area of the cake is $(1+150\%)^{2}$ of the original,
the height remains unchanged, so the volume of the cake is also $(1+150\%)^{2}$ of the original,
$$
\begin{array}{l}
4 \times(1+150\%)^{2} \\
=4 \times 6.25 \\
=25 \text { (pieces) }
\end{array}
$$

Answer: A cake of the same height can feed 25 people.
Therefore, the correct choice is: D.