It's C!
In most cases you can't put AND after a period but in this case u can.
B) finally
Because your concluding your thoughts and wrapping it up
Answer: She doesn't reveal much about herself,and is all the more fascinating for it
Explanation: all the more = even more Often used to highlight contrast from what is assumed.
Other subordinating conjunctions that can show cause-and-effect relationships and function in the same way are for, as, since, therefore, hence, as a result, consequently, though, due to, provided that, because of, unless, as a result of, and so/so that.
Therefore the answer would be (so that)
