Solve the Equation and Check $1 \frac { 1 } { 4 } x = 21 \frac { 1 } { 4 }$

Multiple Choice

Solve the equation and check. $1 \frac { 1 } { 4 } x = 21 \frac { 1 } { 4 }$

A) $x = 20.5$
B) $x = 18$
C) $x = 17$
D) $x = 20$
E) $x = 5.25$