When driving in a group of vehicles that cannot maintain the posted speed of the road, what should you do?

• Ride in single file
• Ride in the left-hand curb or edge of the roadway.
• Ride in the right-hand curb or edge of the roadway.
• Both a and c.
  Explanation:

  "When driving in a group of vehicles that cannot maintain the posted speed of the road, do not travel in staggered formation. Ride in single file and, when necessary, as close as possible to the right-hand curb or edge of the roadway."