Which of the following is not equivalent to this expression, please Find the right answer

2m + 10m + 14 + 3

A. m + 12m + 8 + 9

B. 2m + 10 + 10m + 7

C. 6m + 6m - 1 + 18

D. 15m + 15 - 3m + 2

C. 6m + 6m - 1 + 18