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General Motors did research on what became the minivan$-$a small van suitable for families. The research did not convince them to produce it$.$ Later, Chrysler introduced the Dodge Caravan and Plymouth Voyager minivans, which turned out to be among the most successful models in automotive history. This example most closely demonstrates that

a$.$ marketing research is not as reliable as management's intuition

b$.$ marketing research does not provide correct answers most of the time

c$.$ marketing research does not always provide management with the right answer

d$.$ management should question the methods used to conduct product market research