A stock produced total returns of 9.78%, 13.61%, 1.19%, and 4.90% over the past four years, respectively. Based on this information, calculate the standard deviation? (use 5 decimal points when calculating variance and standard deviation)

A) 2.10%

B) 3.25%

C) 4.32%

D) 5.45%

E) 8.35%