Solution Provider

What is ${9} \dfrac{1}{8} - {8}\dfrac{3}{5}$?
A. $\dfrac{21}{40}$
B. $ {1} \dfrac{21}{40}$
C. $ {2} \dfrac{21}{40}$
D. $ {4} \dfrac{21}{40}$
E. $ {3} \dfrac{21}{40}$