Question

mark is changing the margins, page size, and orientation of his document. what are these tasks doing?
a formatting the document
b proofing the document for spelling and grammar errors
c inserting heading and footers in the document
d filing the document

Explanation:

Changing margins, page size, and orientation are all part of formatting a document. Proofing is for errors, inserting headers/footers is a specific formatting task (but not the overall category here), and filing is about organizing the document's storage.

Answer:

A. Formatting the document