Eva's cost of making five bowls of salad, including implicit and external costs, came to $15 in total. Producing six bowls of salads would increase her total cost from $15 to $20. It would be a smart choice for Eva to produce the sixth bowl if the benefits from the sixth bowl are ____. Question 15Select one: A. less than $5 B. more than $4 C. at least $15 D. more than $5 E. at least $20