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m : n : p = 3 : 5 : 6 maka:
m = 3x
n = 5x
p = 6x

4m + 2n - 3p = 16
4(3x) + 2(5x) - 3(6x) = 16
12x + 10x - 18x = 16
4x = 16
x = 16 ÷ 4
x = 4

nilai m = 3x = 3(4) = 12
nilai n = 5x = 5(4) = 20
nilai p = 6x = 6(4) = 24

selisih nilai m dan p adalah: 24 - 12 = 12
(jawaban C)