Answer
From best to worst, we have Bank B, Bank C, Bank A.
Work Step by Step
Compute and compare the rate of return.
For Bank A, $P=P_0\left(1+\frac{0.02}{365}\right)^{365(1)} \approx 1.0202 P_0$
For Bank B, $P=P_0\left(1+\frac{0.021}{12}\right)^{12(1)} \approx 1.0212P_0$
For Bank C, $P=P_0\left(e^{0.0205(1)}\right) \approx 1.02071 P_0$
From best to worst, we have Bank B, Bank C, Bank A.
