The correct answer should be Compare and Contrast strategy of presentation. In it, you compare numerous items and describe how they are similar and different from each other, so as to prove your point.
B- learning how to make fire was a long struggle for humans
With an online dictionary, you don't have to flick through a physical dictionary looking for the word you need-- you just have to type in what you want.
The answer is D. It helps you to understand that Anne's death was tragic, because she could not prevent others from publishing her diary.