What is the expected constant growth rate of dividends for a stock currently priced at $50, that just paid a dividend of $4, and has a required return of 18 percent?

A. 3.41 pecent

B. 5.50 percent

C. 9.26 percent

D. 12.25 percent

E. None of the above

(My teacher stated the correct answer is C. but I am as well looking for an explanation and curious as to if it is using the present value dividend discount model or fuure value because i'm aware they are slightly different I believe)

Thanks!