I'm really lost; can someone help me work this out? Thanks so much!

Variable cells Final Value 0 Reduced Cost 425 Objective Coefficient 500 Cell Name $B$6 Activity 1 $C$6 Activity 2 $D$6 Activity 3 Constraints Allowable Increase Allowable Decrease 1E+30 425 500 300 1E+30 250 300 27.5 0 0.0 250 400 Shadow Price 0 Allowable Increase 50 Cell $E$2 $E$3 $E$4 Name Benefit A Benefit B Benefit C Final Value 110 110 137.5 Constraint R.H. Side 60 110 80 Allowable Decrease 1E+30 46 1E+30 75 1E+30 57.5 If the right-hand side of Resource C is increased by 40, and the right-hand side of Resource B is decreased by 20, then: Multiple Choice O the optimal solution remains the same. the optimal solution will change. O the shadow price is valid. the shadow price may or may not be not valid