It most definitely won't be a or c, because that's bad this to put in an advertisement. D would be ok, but it wouldn't be the best answer because they already have a slogan. I would choose b, citing an expert opinion, to make the advertisement more persuasive.
Answer:
it is b the small markings on the stone were almost indernible to the naked eye
Explanation:
i did this and got 100% using that awnser and i took it 5 min ago
Answer:
A
Explanation:
This change makes the sentence grammatically correct
