Q57: Why the answer is E?

57 These questions refer to the following graph. According to the graph, which of the following statements must be true? NUMBER OF CAT LICENSES AND DOG LICENSES ISSUED IN TOWN X I. For each of the years 1986 1985-1990 450 through 1990, the number of cat 400 licenses issued was greater 385 360 than that of the previous year. 350 350 320 301 312 II. In Town X more households 300 had dogs in 1986 than in 1985. 255 250 250 230 245 240 III. For at least one of the years 210 200 shown, the number of cat licenses issued was more than 150 15 times the number of dog 100 licenses issued. 50 I only 0 1985 1986 1987 1988 1989 II only 1990 III only a Cat Dog I and II 00 I and