Aanya wrote the four equations that are shown below.

A

6 x minus 8 = 4 (x minus 2) + 2 x
B

3 (x minus 1) + 2 x = 3 (x minus 1) + 2

C

7 x + 2 minus x = 6 (x + 2)
D

4 (x + 3) + x = 5 (x + 1) + 7

She examined them, without solving them, to determine which has exactly one solution. Which of Aanya’s equations has exactly one solution?

A: 6 x minus 8 = 4 (x minus 2) + 2 x
B: 3 (x minus 1) + 2 x = 3 (x minus 1) + 2
C: 7 x + 2 minus x = 6 (x + 2)
D: 4 (x + 3) + x = 5 (x + 1) + 7