The correct answer is Choice D.
Use the given information to construct an equation for the size of the wildfire, $A$, $t$ hours after it was first detected.

Choice A is incorrect because the factor of growth is less than $1$ which means that the size of the fire will decrease each hour.
Choices B and C are incorrect because $10$ is the initial size of the wildfire and not the factor of growth.
✨ Expert's Tip ✨
In an exponential equation $y = A_0 (B)^{\frac{t}{c}}$, $A$is the initial value, $B$ is the growth factor, and $C$ is the period.