Hey there!
The answer to your question should be option D.
When writing for an assignment, you should call on all the writing techniques you've learned in the past.
This is because the skills that you have already learned, can help you with whatever you wright in the present.
For example:
You are in the middle of writing an essay and haven't really written one in a long time, you can use the techniques on your last essay to help you with the essay you are working on now.
Hope this helps you.
Have a great day!