Final answer:
The best method when carrying loads on a motorcycle is to keep the load low and as far forward as possible, to maintain balance and stability.
Step-by-step explanation:
When carrying loads on a motorcycle, the recommended method is to keep the load low and as far forward as possible, which corresponds to option (a). This method helps maintain the motorcycle's balance and stability by keeping the center of gravity low and ensuring that the load does not interfere with handling by being too far rearward.
In contrast to (b), which suggests keeping the load to the rear, this can adversely affect the motorcycle's balance and make it more difficult to control. Likewise, while (c) suggests fastening the load against the frame on the back of the seat may seem safe, it can still raise the center of gravity and affect stability.
Much like how people naturally adjust their stance when carrying a load to maintain balance as depicted in Figure 9.27. For example, a father carrying his son piggyback may lean forward to position their overall center of gravity (cg) above the base of support at his feet.
Similarly, carrying a load properly on a motorcycle helps distribute the weight evenly and ensure the overall balance of the vehicle. Therefore answer is a) Keep the load low and as far forward as possible.