Four contestants faced off in a hotdog-eating competition. They each had five minutes to consume as many hot dogs as they could. The tables below show how many hotdogs each contestant ate in each of the five minutes. Minute Richard Tina Ethan Vecepia 1st 7 3 10 10 2nd 8 4 8 8 3rd 7 5 5 0 4th 4 6 2 3 5th 5 7 1 4 Which contestant shows diminishing marginal returns with respect to time in the contest? Group of answer choices Tina Richard Vecepia Ethan