challenge: When did Earl W. Kintner serve as the chair of the Federal Trade Commission?
  
  A. June 11, 1963 – March 20, 1965
  B. June 11, 1955 – March 20, 1957
  C. June 11, 1967 – March 20, 1969
  D. June 11, 1959 – March 20, 1961
  Answer: 