Final answer:
The demerit points for failing to stop at an unprotected railway crossing when driving a bus vary by jurisdiction and are not specified in the given options. It's crucial to check local traffic laws for accurate information.
Step-by-step explanation:
If you fail to stop at an unprotected railway crossing when driving a bus, the number of demerit points that will be added to your licence varies by jurisdiction. However, among the options provided (three, five, four, six), the default correct answer cannot be determined without specific regional or state law references. It is important to consult local traffic laws to understand the exact penalties for failing to stop at railway crossings. Operating a bus requires adherence to strict safety regulations due to the number of passengers and the vehicle's size. Traffic violations, especially those concerning railway crossings, typically carry heavy penalties, including a significant number of demerit points, fines, or even suspension of the driver's license.