MDL Corporation had the following stock prices at the end of each year; 2016: $21, 2017: $23, 2018: $35, 2019: $32. The company paid $1 dividend in 2018 and $2 dividend in 2019. Estimate the mean return for this company.

A. 19.9%

B. 21.1%

C. 22.7%

D. 27.8%

Please please include the formula with your answer, I need to be able to do lots of problems like these! Thank you so much!