Your Mother Helped You Start Saving $10 a Month Beginning

Your mother helped you start saving $10 a month beginning on your 5th birthday, which is on May 1st. She always made you make your deposit on the first day of each month just to "start the month
Out right". Today, you turn 21 and have $6,984 in your account. What is the rate of return on your
Savings?

A) 13.62%
B) 13.68%
C) 13.75%
D) 13.81%
E) 13.86%