In analyzing an informational text, looking at titles, headings, subheadings, graphics, and illustrations?

C - it should be done before reading the text, as doing this alerts the brain to what is coming, making memorization easier. It helps you get a handle on what you will be reading so that it makes more sense to you when you start reading it. You'll find you can read faster when you've first read and studied all those things you mentioned before moving on to the text. For a serious student, reading and studying all those things before reading the text is essential.