Latex Coder 2

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