The answer could be A or B because the date of the webpage could be outdated and the author of the page could be unreliable. I personally would say A.
A dash should be inserted after the word nanoscale
Answer:
You may choose planned exercise or whenever you can fit it in your day, or a ... of getting active; How to fit activity into your life; What kind of busy are you? ... is one of the most important things you can do, each day if you can, for good healthExplanation:
D because it says that he was mad AS hell. A simile uses like or as.