Which expression best represents the difference between triple a number and double a number?

Responses
A 3(x - 2x)3(x - 2x)
B x2
- x3
x 2 - x 3
C 3x - 2x3x - 2x
D 2x - 3x2x - 3x
E x3
- x2

D 2x - 3x2x - 3x

3(x - 2x)