To write effectively for mobile devices, which of the following should be avoided?

A) Headings
B) Point form
C) Short paragraphs
D) Long paragraphs

Long paragraphs should be avoided when writing for mobile devices as they can be difficult to read and may discourage users from engaging with the content. Short paragraphs are easier to scan and understand on smaller screens. Headings and point form can also be used effectively on mobile devices in order to highlight key information and make the content more digestible.