What is the most powerful level in the union structure?

According to Table M7-3, which is the final simplex tableau for a problem with two variables and two constraints, the 0.667 in the X1 column means that

A) to produce 1 unit of X1, 0.667 units of X2 must be given up. B) to produce 1 unit of X2, 0.667 units of X1 must be given up. C) if 1 unit of X1 is produced, profits on X2 will decrease by 0.667. D) if 1 unit of X1 is produced, profits on X2 will increase by 0.667. E) None of the above

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