The Zj $-$ Cj row $($also called Z row$)$ of a simplex tableau gives:

Select one:

a$.$

the number of units of each basic variable that must be removed from the solution if a new variable is entered.

b$.$

the maximal value a variable can take on and still have all the constraints satisfied.

c$.$

the net profit or loss that will result from introducing one unit of the variable indicated in that column into the solution.

d$.$

the gross profit or loss given up by adding one unit of a variable into the solution.