Choice A is the correct answer. Match the description to graph features.

1. Initial: 200 bacteria → y-intercept at 200.
2. Doubling: Population increases → growing curve, not decreasing.
3. Shape: Exponential growth curves upward steeply.
4. Equation: $P(t) = 200(2)^{t/4}$.

💡 Strategic Tip: Doubling = exponential growth = upward curving graph.

Choice B is incorrect because the population grows, not decreases. Choice C is incorrect because doubling is exponential, not linear. Choice D is incorrect because the initial value is 200, not 400.