What does the reduced cost of a non-basic variable indicate in linear programming?

What does the reduced cost of a non-basic variable indicate in linear programming?

• A. The current coefficient of the variable in the objective function.
• B. The amount by which the objective would improve if that non-basic variable entered the basis.
• C. The slack value of the associated constraint.
• D. The change in the objective if a basic variable leaves the basis.

Answer: (B)