challenge: Which of the following statements about Mutual Street Arena is true?
  
  A. It was the first ice hockey arena in Canada.
  B. It was the site of the first radio broadcast of an ice hockey game in 1923.
  C. It was home to the Toronto Maple Leafs for their first 20 seasons.
  D. It was the only ice hockey arena in eastern Canada with a mechanically frozen ice surface for eleven years.
  Answer: 