Consider a one-month investment in Microsoft stock. Suppose you buy the stock this month at $85 and sell the stock the next month for $90. Further assume that Microsoft does not pay a dividend between the months. What is the continuously compounded monthly return on Microsoft stock (to 2 decimal places)? Select one: O a. 4.71% O b.5.71% O c.5.21% d. 6.21% e. 4.21%