Translate the Phrase into an Algebraic Expression $21$ A) $- ( x + 21 )$

Multiple Choice

Translate the phrase into an algebraic expression. A number x decreased by $21$

A) $- ( x + 21 )$
B) $\frac { 21 } { x }$
C) $\frac { x } { 21 }$
D) $21 - x$
E) $x - 21$