A Researcher Wants to Determine How Citizens of Indianapolis Feel

A researcher wants to determine how citizens of Indianapolis feel about the mayor's proposed changes for the Indianapolis public school system.Which of the following sampling procedures would you recommend to this researcher?

A) Insert a questionnaire in the magazine, Indianapolis Monthly, and ask readers to complete and return the questionnaire.
B) Procure a list of voters from the city clerk's office and draw a random sample to receive the questionnaire.
C) Draw a random sample from the Indianapolis telephone directory to receive the questionnaire.
D) Take a random sample of 100 blocks from a city map and interview all the adults in those blocks.