What type of policy consists of the declarations, conditions, endorsements, and other attachments applicable to a single line of insurance?

A monoline policy is specifically designed to cover a single line of insurance, meaning it focuses on one type of coverage, such as liability or property insurance, without bundling it with other coverages. This type of policy will include various components such as the declarations, which outline the specifics of the policyholder, the coverage amounts, and the type of insurance provided. It also includes conditions that detail the responsibilities of both the insured and the insurer, endorsements that may modify the coverage, and any other relevant attachments.

In contrast, a multiline policy combines multiple lines of insurance into a single contract, which is not the case in this question. A bundle policy typically refers to a package that includes multiple coverages in one, while an integrated policy generally implies a combination of various forms or endorsements to create a cohesive product covering multiple needs. Therefore, the defining characteristic of a monoline policy makes it the correct answer, as it distinctly pertains to a single type of insurance line.