(A) The dates when the CEO’s assumed their current positions have not been specified.

　　(B) No information is given concerning the average number of years that CEO’s remain in office.

　　(C) The information is based only on companies that have been operating for at least 20 years.

　　(D) Only approximate information is given concerning the average age of the CEO’s 20 years ago.

　　(E) Information concerning the exact number of companies in the sample has not been given.

　　Questions 19-20 are based on the following.

　　Surveys show that every year only 10 percent of cigarette smokers switch brands. Yet the manufacturers have been spending an amount equal to 10 percent of their gross receipts on cigarette promotion in magazines. It follows from these figures that inducing cigarette smokers to switch brands did not pay, and that cigarette companies would have been no worse off economically if they had dropped their advertising.

　　19. Of the following, the best criticism of the conclusion that inducing cigarette smokers to switch brands did not pay is that the conclusion is based on

　　(A) computing advertising costs as a percentage of gross receipts, not of overall costs

　　(B) past patterns of smoking and may not carry over to the future

　　(C) the assumption that each smoker is loyal to a single brand of cigarettes at any one time

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