What is $\displaystyle {5}\frac{5}{7} - {3}\frac{1}{7}$?
A. $ {2}\dfrac{4}{7}$
B. $ {3}\dfrac{4}{7}$
C. $ \dfrac{4}{7}$
D. ${2}\dfrac{6}{7}$
E. $ {3}\dfrac{6}{7}$
A. $ {2}\dfrac{4}{7}$
B. $ {3}\dfrac{4}{7}$
C. $ \dfrac{4}{7}$
D. ${2}\dfrac{6}{7}$
E. $ {3}\dfrac{6}{7}$
