i have 4 questions here, can i get some helps there

If the average total cost is decreasing in the short run, then O A. the marginal cost is less than the average total cost. O B. the total cost is at a maximum. O C. the marginal cost is decreasing. O D. the average variable cost is increasing. O E. the total cost is decreasingIf 100 cookies are produced, then the average total cost is $0.60 per cookie and the average variable cost is $0.20 per cookie. If 200 cookies are produced, then the average variable cost is $0.40 per cookie (due to law of diminishing marginal returns). What is the total cost of producing 200 cookies? O A. $80 O B. $70 O C. $90 O D. $120If average total cost is equal to marginal cost, O A. marginal cost is at a minimum. O B. total fixed costs are at a maximum. O C. total costs are at a maximum. O D. average total cost is at a minimum. O E. average variable cost is at a maximum.If the marginal product of labour is falling, then the average product of labour O A. can be rising, falling, or at its maximum; and the marginal cost can be rising, falling or at its minimum. O B. can be rising, falling, or at its maximum; but the marginal cost must be falling. O C. can be rising, falling, or at its maximum; but the marginal cost must be rising O D. must be falling; but the marginal cost can be rising, falling, or at its minimum. O E. must be falling; but the marginal cost must be rising