challenge: What was the outcome of the merger between the Railway Procurement Agency and the National Roads Authority under the Roads Act of 2015?
  
  A. The NRA was dissolved and the RPA became the sole authority
  B. The RPA was merged into the NRA and the body was renamed Transport Infrastructure Ireland
  C. The NRA and RPA became separate entities with distinct responsibilities
  D. The merger resulted in the creation of a new agency responsible for Ireland's airports
  Answer: 