As a promotional experiment, Omega Company distributes four million catalogs. In one of the two versions of the catalog, the description of each item for sale mentioned a "Made by Hand" label. The number of purchases from consumers receiving that catalog was twenty percent greater than the number of purchases from consumers receiving a catalog that did not mention the label. Thus, the mention of the label stimulated sales. the first assumption: the number of catalogs with "Made by Hand" labels is the same or fever than the number of catalogs without "Made by Hand" labels.
the second assumption: The group of consumers that received catalogs with "Made by Hand" labels is not differ from the group of consumers that received catalogs without "Made by Hand" labels.
Which of the following, if true, could best be used to challenge the conclusion drawn above?
(A) Consumers receiving the catalog mentioning the label had previously purchased items from Omega Company by mail but consumers receiving the other catalog had not. - the second assumption.
(B) Surveys showed that consumers returned purchased items to Omega Company during the promotional campaign at the same rate regardless of which catalog they received. - there is no difference between catalogs.
(C) The number of purchases from Omega Company declined substantially after the promotional campaign was completed. - there is no difference between catalogs.
(D) Omega Company mailed three times as many catalogs that did not mention the "Made by Hand" label as catalogs that did mention the label. - it strengthens the argument.
(E) Omega Company sold twenty percent fewer items during the year of the promotional campaign than it had during the previous year. - there is no difference between catalogs.
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