Write the following as a single rational expression.

fraction numerator 170 plus 50 x over denominator x end fraction divided by fraction numerator 120 plus 30 x over denominator x end fraction

A.)

fraction numerator 17 plus 5 x over denominator 12 plus 3 x end fraction
B.)

fraction numerator 50 plus 20 x over denominator x squared end fraction
C.)

fraction numerator 2 left parenthesis 25 plus 10 x right parenthesis over denominator x squared end fraction
D.)

fraction numerator 120 plus 30 x over denominator 170 plus 50 x end fraction