Based on the premise "One frequently used basis is size of the problem: that is, 7 states account for about 45 percent of all unfiled returns (California, Florida, Illinois, New York, Oklahoma, Pennsylvania, and Texas).", can we conclude the hypothesis "The problem is that 7 states account for about 45 percent of all unfiled returns." is true (see options)?

(a). yes;
(b). it is not possible to tell;
(c). no;
(a).