The structure of a proposal:

A) does not include the purpose as a separate heading.
B) does not include the budget of a project.
C) is usually designed to be in the email format.
D) includes details about the manner in which a problem is solved.

Proposal Structure

The format of a document designed to suggest a plan of action or idea, often including sections like introduction, methodology, and conclusion.

Purpose Heading

A title or heading in a document that indicates the aim or goal of the section it introduces.

Project Budget

An estimation of the costs, resources, and revenues necessary to complete a project within a defined timeframe.