If $r$ is the radius of a spherical balloon at time $t$ and the surface area of the balloon changes at a constant rate $K,$ then ....
- A$4 \pi r^2 = \frac{K t^2}{2} + c$
- B$8 \pi r^2 = K t + c$
- C$\pi r^2 = \frac{K t^2}{2} + c$
- D$4 \pi r^2 = K t + c$
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