A)

B)

C)

D)

The shortest side will be (7x-2) - (2x-4) = 5x+2

The longest side will be (7x-2) + (2x-4) = 9x-6

The third side of the triangle has to be in between these two expressions not including them

So the only possible option is B) 6x units

Let me know if you have any questions

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