challenge: What happened to the staff at St Athan Road and Aberthaw Low Level when the southern section of the Llantrisant-Aberthaw line closed to passengers?
  
  A. They were promoted to manage the entire Llantrisant-Aberthaw line
  B. They were withdrawn and their duties were allotted to the staff at Gileston
  C. They were relocated to Cowbridge
  D. They were transferred to the northern section of the line
  Answer: 