Your correct on everything
I would say the correct answer is that has an undetermined answer.
If a subject has been thoroughly covered, then there is no need for this researcher to do it all over again. If it's impossible to answer, there is no need to try. If it can be answered easily, then it doesn't really require a research. This leaves us with the last option, because a researcher might want to try and determine the answer.
B. To entertain readers with an interesting anecdote from the author’s childhood
Answer: To entertain with an exciting true story & to inform readers about a major accomplishment in her life
Explanation: I took the test
The first choice is your answer
