Which type of coverage involves protecting other structures on a property?

The correct choice is Other Structures Coverage because it specifically addresses the protection of structures that are not part of the main dwelling on a property. This includes features like garages, sheds, fences, and other detached buildings that may exist on the homeowner's lot. This type of coverage is crucial for homeowners who want to ensure that all structures on their property are safeguarded against risks like fire, vandalism, or severe weather.

In contrast, personal property coverage generally protects items within the home itself, whereas liability coverage pertains to legal responsibility for injuries or damages that occur to others. Optional coverage can refer to additional coverages that might be added to a policy, but it does not exclusively relate to the protection of other structures. Therefore, Other Structures Coverage is explicitly designed for this purpose, making it the best answer to the question.