Answer:
No, you can't use "inquire" like this. You could say:
"The enterprise asked the authority for the relevant information." -- This does not actually say that they obtained it, however. The authority may have refused. Note that you ask about a subject, but you ask for information.
"The enterprise obtained the relevant information from the authority." -- This normally implies that they obtained it in response to an inquiry or request, so you don't really need to say that separately
Explanation:
Yes you can use i for your thesis
I believe it would be to inform, the particular excerpt isn't really informing about anything, and its not persuading the reader to do anything, simply attempting to entertain the reader with a story.
The third one is the correct answer. I just read the book and took a test on it.
