Answer:
(D) marginal cost, the average variable cost, and the average total cost will shift up.
Explanation:
Given the nature of business of AI's Donuts, flour prices is part of the variable cost of the business as it will change will any change in the output of the firm.
An increase in flour prices, a variable cost, will have the following effect on the following costs.
Therefore, option (D) is correct as marginal cost, the average variable cost, and the average total cost will shift up.