When Developing Paragraphs,you Should Use Only One Method Within Each

As a rule,keep subject lines and headlines to around ________ when writing messages for smartphone users. A)5 characters B)10 characters C)15 characters D)20 characters E)25 characters

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 E)using linear organization