Amazon.com stock prices gave a realized return of 5%, -5%, 10%, and -10% over four successive quarters. What is the annual realized return for Amazon.com for the years?

A) -1.25%

B) 1.25%

C) 0.00%

D) 2.50%

What is the quarterly standard deviation of Amazon.com?

A) 83.3332%

B) 9.1287%

C) 62.5%

D) 7.9057%