The superintendents of two school districts are considering a merger in which the two school districts would become one larger school district. the superintendents want to conduct surveys in their districts to determine whether district residents support the merger. for which of the following survey methods could the results be used to accurately determine the level of support among district residents for the merger? a. call all residents who have school–age children and ask whether or not they support the merger. b. ask residents who attend meetings of the board of education whether or not they support the merger. c. randomly call approximately 25% of residents and directly ask whether or not they support the merger. d. provide all residents a form asking whether or not they support the merger and have residents mail in their responses.