What technique can help a motorcycle maintain balance on a hill?

Answer: B — Using the foot brake to hold the bike

Using the foot brake to hold the bike is an effective technique for maintaining balance on a hill. When parked or stopped on an incline, applying the foot brake helps to secure the motorcycle in place and prevent it from rolling back. This technique allows the rider to retain control while preparing to start again or wait for traffic conditions to improve. In contrast, aggressively accelerating can lead to loss of control on a hill, as it may cause the rear wheel to spin or the motorcycle to lurch forward unexpectedly. Leaning towards the uphill can help with stability during a turn but does not provide the same level of control when coming to a stop on an incline. Sharp turns with the handlebars would disrupt the balance of the motorcycle, especially on a slope, increasing the risk of tipping over. Therefore, the most effective and safest option for maintaining balance on a hill is to use the foot brake.