Which of the following vehicle weight values can change depending on circumstances?

Gross Vehicle Weight (GVW) refers to the total weight of a vehicle when it is loaded, which can fluctuate under different conditions. For instance, the GVW increases as additional cargo or passengers are added to the vehicle. Conversely, it can decrease if items are removed. This variable nature of the weight due to the loading conditions is why GVW is the correct answer to this question.

In contrast, other weight measurements like Net Vehicle Weight (NVW) and Curb Weight (CW) are either static or do not change based on typical usage. NVW represents the weight of the vehicle without any cargo but includes all fluids like oil and fuel, while CW generally indicates the weight of a vehicle in its ready-to-drive state without additional load, and both remain constant as they are specific to the vehicle's design.

Axle Weight Rating (AWR) is a specification set by the manufacturer that indicates the maximum weight that can be safely supported by each axle. This value does not change under normal operating conditions and is defined based on design limits rather than operational circumstances.

Therefore, the ability of Gross Vehicle Weight to vary with the addition or removal of weight makes it the correct choice in this context.