What are the two questions used to determine the risk factor of a boat?

The correct choice focuses on determining the risk factor associated with a boat by considering its recent usage location. Understanding where a boat was used last is crucial because it helps assess exposure to certain aquatic environments that may be contaminated with invasive species or other organisms that could threaten local ecosystems.

For example, if a boat was last used in a body of water known to harbor invasive species, that information is vital for making informed decisions about inspection and measures to prevent the spread of those species. This emphasizes the importance of identifying areas that might contribute to the risk factor, enhancing the effectiveness of management efforts aimed at protecting natural resources.

The other questions, while relevant to various considerations regarding boats, do not directly address the immediate risk of spreading invasive species or other ecological threats in the same way. Knowing the boat's manufacturing origin, engine type, or passenger capacity may provide information related to the boat itself but is less significant in evaluating the immediate risks associated with its prior use.