What scenario qualifies as knowing contributory negligence?

The scenario that qualifies as knowing contributory negligence is when the plaintiff knew the risk and voluntarily chose to proceed. This concept is rooted in the idea that if an individual is aware of a hazardous condition or potential danger but decides to engage in an activity anyway, their decision reflects a disregard for their own safety. In many jurisdictions that adhere to the contributory negligence doctrine, the plaintiff's knowledge of the risk can act as a complete bar to recovery if they contribute to their own injury through their voluntary actions.

In this context, if the plaintiff is aware of the risks involved and still decides to go forward, their actions can be seen as contributing to the harm they later suffer due to their own negligence. Awareness combined with a choice to proceed indicates a conscious decision that undermines their claim for damages, as the law does not favor individuals who knowingly place themselves in dangerous situations.

The other scenarios do not reflect knowing contributory negligence appropriately. Being unaware of the risk, having no alternative but to proceed, or suffering injuries due to another's negligence does not fit the criteria of knowing contributory negligence, as they do not involve the requisite knowledge and voluntary acceptance of risk by the plaintiff.