17. A discount chain wants to measure the effects of a possible new advertising campaign and different pricing levels on

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17. A discount chain wants to measure the effects of a possible
new advertising campaign and different pricing levels on one of its
major line of items. In the research there are three levels of
advertising (3 times a day, 5 times a day, and 7 times a day) and
three pricing levels (low, middle and high). They tested in nine
cities with each combination and found that high advertising and
middle pricing were the most effective in raising revenue for the
chain. The explanatory/independent variable(s) used was/were
​I. The Cities
​II. Revenue
​III. The Advertising Campaign
​IV. The Pricing
A) III and IV​​​​​B) None of the Answers
C) II​​​​​​D) I
E) II and IV