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Which expression is the result of the perimeter of rectangle b minus the perimeter of rectangle a

Which expression is the result of the perimeter of rectangle b minus the perimeter of rectangle a class=

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Banabanana
Retangle B perimeter = 2(3x+5) + 2(2x-2)
                                      6x + 10 + 4x - 4
                                      10x + 6

Retangle A perimeter = 2(2x+8) + 2(x-1)
                                      4x + 16 + 2x - 2
                                      6x + 14


(10x + 6) - (6x + 14) =
10x + 6 - 6x - 14 =
4x - 8    ←  answer