In applying the simplex solution procedure to a minimization problem to determine which variable enters the solution mix

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In the simplex solution procedure for a minimization problem, we need to pick the variable that will give the most decrease in the objective function. This can be determined by calculating the value of C_j - Z_j for each variable where C_j is the coefficient of the variable in the constraint equation and Z_j is the corresponding coefficient in the objective function equation. We need to choose the variable that has the most negative result from this calculation, as this will give the most decrease in the objective function when the variable enters the solution mix. Therefore, the best choice is D.

In Applying the Simplex Solution Procedure to a Minimization Problem