The principle means repeating some of the aspects of a design throughout the entire presentation. It would also help to organize information that would guide readers. Examples would be using a template,same font size and type,font colour and color scheme.
It is between A and C. C isn't as exaggerated as anguish would be and A looks devious. I'd go more along the lines of C.
12g of Carbon are in 44 grams in Carbon Dioxide, need an explanation?