All of the following EXCEPT ________ will help you compose effective mobile messages.

A) using short subject lines and page headings
B) using a top-to-bottom linear flow to organize the message
C) saving space by presenting the message in one long paragraph
D) putting what your readers want to know at the top of the message

Saving space by presenting the message in one long paragraph is not an effective way to compose mobile messages. Mobile users prefer short and concise messages that are easy to read quickly on their devices. Using short subject lines and headings, a top-to-bottom linear flow, and putting important information at the top are all effective strategies for mobile messaging.