B. Roots
Roots are the smallest meaningful parts of words. For example the root word of aquamarine would be Aqua, which means water. So the root word can also give you a hint on the meaning of the word.
Hope this helps :)
The answer is D a reader need diaries and journals
The answer for your question is d because it explains more details of the car than the other ones
I'd say option B, because that is how the story or the main problem was "resolved" (as the phrase suggests) or taken care of.