challenge: Which of the following bus services are available directly outside Blackrock railway station?
  
  A. Dublin Bus route 14, Go-Ahead Ireland route 56
  B. Dublin Bus route 46E, Go-Ahead Ireland routes 114 and S6
  C. Dublin Bus route 41, Go-Ahead Ireland route 123
  D. Dublin Bus route 16, Go-Ahead Ireland route 101
  Answer: 