With regard to headings in a memo,in single-spaced text:

A) capitalize all major words throughout the text.
B) type main headings flush with the right-hand margin in bold.
C) capitalize all the words in the first sentence.
D) type main headings flush with the left-hand margin in bold.

Single-Spaced Text

Text formatting where there is no extra space between lines, each line of text follows directly beneath the previous one.

Main Headings

The primary and most prominent titles in a written document, designed to signal the beginning of major sections and summarize their content.

Capitalize

To take advantage of a situation or to generate financial profit, or in accounting, to record an expense as an asset.