Choice A is the correct answer. Calculate the number of doubling periods.

1. Time elapsed: 2030 - 2020 = 10 years.
2. Doubling periods: $\frac{10}{2} = 5$ periods.
3. Formula: $P(t) = P_0(2)^{t/2}$.
4. Calculate: $P(10) = P_0(2)^5 = P_0(32) = 32P_0$.

💡 Strategic Tip:$n$ doublings = multiply by $2^n$.

Choice B is incorrect because this is $2^4$ (only 4 doublings). Choice C is incorrect because this assumes linear growth. Choice D is incorrect because this is $2^6$ (6 doublings).