In the food truck simulation, which of the following was not true:单项选择题

A

market research was not that useful, sometimes we have to learn by doing

B

there was a bit of an element of luck, but one could converge on a "winning combo" in time

C

using a food cart allowed one to test variables/combinations in less time than a food truck (one day vs. one week)

D

students who changed multiple variables at once did better than other students who isolated variables

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