Use the Distributive Property to Write the Expression $7 x ( b - x )$

Multiple Choice

Use the distributive property to write the expression $7 x ( b - x )$ without parentheses. Simplify the result, if possible.

A) $7 b x - 7 b ^ { 2 }$
B) $b x + b - 7 x ^ { 2 }$
C) $7 x + b - x$
D) $7 b x - 7 x ^ { 2 }$
E) $b x - 7 x ^ { 2 }$