What is a significant characteristic of a bolt-action firearm?

A significant characteristic of a bolt-action firearm is its reputation for high accuracy and strong action. Bolt-action rifles are designed to provide a consistent, stable platform for shooting, as the bolt mechanism allows for precise manual operation. This design contributes to enhanced accuracy, as the shooter has direct control over the feeding and ejection of cartridges, minimizing the chance of mechanical failure during operation.

The strong action of a bolt-action firearm refers to its robust construction, which is capable of handling high-pressure cartridges effectively. This strength is not only beneficial for the longevity of the firearm but also increases the potential for accuracy, as the action’s reliability ensures that the bullet is fired consistently in alignment with the rifle's sights.

Other options relate to different firearm characteristics that do not accurately reflect the nature of bolt-action rifles. For example, a bolt-action rifle does not automatically eject spent cartridges; this is a feature typical of semi-automatic or automatic firearms. Additionally, bolt-action rifles are not primarily characterized by their lightweight design, as they can vary significantly in weight based on the materials used and the construction style. Finally, shotguns primarily use different mechanisms, such as pump-action or semi-automatic actions, making option D irrelevant to bolt-action firearms.