You need to choose C if you want to apply bullet points to your document. Bullet points are normally used when there are different sentences of topics that you would like to become clearer to your reader. This will make sure that the readers will be able to read the whole document. People usually love reading lists instead of paragraphs so this would be very effective if you want them to read your entire document.
Take note that bullet points can be used to convey complete sentences but sometimes, they may only contain words. It will depend on what you are writing about. Bullet points can also be used to highlight some details that people may otherwise miss.