The Allowable Decrease for a Changing Cell (Decision Variable) Is

The allowable decrease for a changing cell (decision variable) is

A) the amount by which the constraint coefficient can decrease without changing final optimal solution.
B) an indication of how many more units to produce to maximize profits.
C) the amount by which objective function coefficient can decrease without changing the final optimal solution.
D) an indication of how much to charge to get the optimal solution.