24 POINTS!!!!!!!!!!!!!!

Which of the lists below contains UNLIKE (not like) terms?

A2x , -3x , -x , 0.01 x
Bx , 5x2 , 99 x y , 9
C-x , x , 4x , 0.2 x , (1/4) x
D- 2 , 7 , 4 , 89