challenge: Which of the following celebrities participated in the pre-inauguration gala honoring Lyndon B. Johnson?
  
  A. Alfred Hitchcock, Bobby Darin, and Barbra Streisand
  B. Elvis Presley, Frank Sinatra, and Marilyn Monroe
  C. Charlie Chaplin, Audrey Hepburn, and Dean Martin
  D. John Wayne, Elizabeth Taylor, and Louis Armstrong
  Answer: 