challenge: Which bus companies have added services to the University of Guelph campus?
  
  A. Guelph Transit, Aboutown Northlink and FlixBus
  B. Guelph Transit, Aboutown Northlink and Greyhound Canada
  C. Guelph Transit, Aboutown Northlink and Ontario Northland
  D. Greyhound Canada, Megabus and Coach Canada
  Answer: 