Atheism - disbelief in and rejection of all proposed theologies presented to date....
Works for me ... I like your use of the word, "rejection." I would add a simple statement to it, to wit:
There Are NO Gods. Works for me.
(A) has been revised to "lack of a belief in gods."
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Atheism isn't a deficiency, a lack, it's being able to tell your ass from a hole in the ground. Nor is it merely a belief. So "(C) There are NO gods." works for me too.
Simple but succinct. I would add..nor are there ANY supernatural entity.
No ghosties, goblins nor long legged beasties nor things that go bump in the night.
I choose A, the revised A
In a general sense, the revised (A): Lack of belief in any god.
Answer "A" seems to fit the best. It's the closest to the opposite of religion. Religion tends to focus in on a specific point we know as dogma. Atheism rejects it. Reality is like many other subjects, if you don't see the the whole picture you're likely missing the point.