challenge: Which of the following statements about Dorothy Ann Thrupp's hymns is true?
  
  A. Additional hymns have been wrongly attributed to Thrupp due to insufficient authority.
  B. Thrupp did not write any hymns for collections other than Hymns for the Young.
  C. Thrupp's hymns are all signed with her full name at the end.
  D. All her hymns in the Hymns for the Young were attributed to her.
  Answer: 