Choice A is the correct answer. Evaluate at $t = 0$.

1. Substitute: $S(0) = \frac{10000}{1 + 9e^0} = \frac{10000}{1 + 9}$.
2. Simplify: $S(0) = \frac{10000}{10} = 1000$.
3. Result: 1,000 cars sold initially.

💡 Strategic Tip: Initial value of logistic function: $\frac{K}{1+A}$.

Choice B is incorrect because this is the carrying capacity (maximum). Choice C is incorrect because this calculation is wrong. Choice D is incorrect because this would be if $A = 1$, not $A = 9$.