Answer:
b. fixed
Step-by-step explanation:
-Dependent refers to a valariable that changes when other factors change.
-Fixed cost refers to a cost that doesn't change when the amount of goods produced increases or decreases.
-Opportunity cost refers to the benefit that you would have received from the option that was not chosen.
-Marginal cost refers to the change in the cost when you produce an additional unit.
According to this definitions and as the statement refers to a cost that doesn't change, the answer is that as output is increased or decreased, these fixed costs remain unchanged.