can you help me with these questions?

27. What is a shadow price for a constraint?

A. the market price for an illegal good

B. the change in the objective value that occurs when the RHS is increased by one unit

C. the market price

D. none of the above

28. A basic minimization problem will have:

A. an objective variable that the decision maker wants to make small

B. all of the options are correct

C. constraints that define minimum requirements to meet

D. non-negativity constraints that require choices to be zero or larger

29. True, False, Uncertain. A basic maximization problem has RHS values that are upper limits while a basic minimization problem has RHS values that are lower limits.

30. True, False, Uncertain. A minimization problem for nutrition with a constraint like 0.10A + 0.25B 1 (where A and B are choice variables representing food options) indicates that any feasible solution must meet the lower limit of 1 unit of this constraint's quantity.