Congressman Jones experienced a drop in his approval numbers after announcing that taxes in his district would increase the following year. His office also received a significant number of phone calls decrying this tax raise. Nevertheless, he claims that reactions to the tax increase were unrelated to his drop in voters' approval of him. Which of the following, if true, most strongly supports Congressman Jones's position? ['Congressman Jones previously raised taxes in his district and received a similar number of phone calls.', 'Elected officials are only likely to attribute drops in their approval numbers to policies only when citizens call their offices about these policies.', "The citizens who called in to Congressman Jones's office had all voted for him in the previous election.", 'All elected officials in his area experienced similar drops in approval numbers at the same time.']