Final answer:
The rate at which the investment was made is 6%.
Step-by-step explanation:
To find the rate at which the investment was made, we need to divide the amount earned ($60) by the initial investment ($500) and then divide by the number of years (2).
Therefore, the rate is $60/$500/2 = 0.06 = 6%.
So, the correct answer is A. 5%.