In: Finance
Monthly stock prices and returns for Tesla (TSLA) are provided in the table below. What is the standard deviation of the monthly returns?
| Date | TSLA Price | TSLA Return | 
| 11/29/19 | 329.94 | 4.77% | 
| 10/31/19 | 314.92 | 30.74% | 
| 09/30/19 | 240.87 | 6.76% | 
| 08/30/19 | 225.61 | -6.62% | 
| 07/31/19 | 241.61 | 8.12% | 
| 06/28/19 | 223.46 | 
| A. | 
 3.21%  | 
|
| B. | 
 7.35%  | 
|
| C. | 
 13.60%  | 
|
| D. | 
 8.63%  |