The correct answer is D. Desktop publishing.
Desktop publishing is a computer-based system for designing and producing documents that look like they were typeset by a professional. It involves the use of page layout software to create documents that include text, graphics, and other elements.
Word processing software is used to create and edit documents, such as letters, reports, and manuscripts. It allows users to type text, insert and delete text, and format text.
Computer-aided design (CAD) software is used to create designs for products, such as cars, buildings, and machines. It allows users to create 2D and 3D models of objects.
Web page authoring software is used to create and edit web pages. It allows users to create web pages that include text, images, and links to other web pages.
Desktop publishing software is the most appropriate for controlling the design and layout of complex documents like newsletters and brochures because it allows users to create documents that look like they were typeset by a professional. It includes features that allow users to create and edit text, insert and delete text, format text, and add graphics and other elements to documents.