Why should you never share a lane with a motorcycle rider?

• Motorcycles are too slow to keep up with cars.
• Motorcycles need the entire lane to travel safely.
  Explanation:

  "

  You must always allow full-lane space for motorcycle riders because although smaller than vehicles, they require the entire lane width for safe maneuvering.

  "
• Motorcycles are required to ride on the shoulder.
• All of the above.