Mass sermon meetings were held particularly as part of the spread of George Whitefield's ideas. In one case the number attending a meeting in Boston was reported as 20,000 when it was then only a town with a steady population of 17,000.
Of the answers presented in the multiple choice options A is the best description."Newspapers published a series of interviews with Whitefield himself." as he was a great publicist and made clever use of the media available at the time.