A or b but I would go for A
Answer:
The last one
Explanation:
It is formal and states the reason
Go to the teacher, and have a little nice friendly talk. Point out that you just joined the class, so of course you don't have the current assignment ready, simply because it was already in progress when you arrived. Ask her for some reading that you can start doing now, to start learning the subject that everyone else was working on before you arrived.
Answer:
Documentary
Explanation:
Encyclopedia is Tertiary, Diary is Primary, and Interview is Primary. Documentary comes directly from the main source, the person with the camera. Nothing is in the middle.
