challenge: What is a key difference between telethons and nationally televised benefit concerts?
  
  A. Benefit concerts are only held annually, while telethons can be held at any time
  B. Benefit concerts are longer than telethons and are meant to raise money for annual charity drives
  C. Telethons are held for a specific cause, while benefit concerts are general fundraising events
  D. Telethons are shorter than benefit concerts
  Answer: 