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manager.png
The figure above illustrates a managerial table of organization in which each person, except those on the lowest level, supervises exactly two persons on the next lower level. If each lower level contains exactly one person more than the next higher level, which of the following could be the total number of persons in an organization built on such a pattern?(A) 7
(B) 16
(C) 20
(D) 28
(E) 35