Before starting a turn, what should a motorcyclist do regarding gears?

Answer: B — Change gears to prevent a power change in the middle of the turn

Before making a turn on a motorcycle, it is important for the rider to change gears to avoid any potential power changes during the maneuver. Transitioning to a gear that allows for smooth acceleration out of the turn ensures that the rider has adequate control and power delivered to the rear tire, facilitating better traction and stability. If a motorcyclist were to shift gears during the turn, it could lead to unintended increases or decreases in power, which can disrupt the bike's balance and control. Maintaining the appropriate gear before entering the turn, especially one that provides sufficient power without over-revving the engine, allows for a safer and more confident maneuver.