The answer is C as it is said at the start of the introductory paragraph I hope this helps
Answer;
The Huronian Supergroup <span>is </span>particularly<span> exciting and </span>interesting<span> because, by chance, these </span>rocks<span> were laid down at a period when the atmosphere underwent a transition from containing no free oxygen to containing at least some free oxygen.”
</span> Explanation;
The Huronian
Supergroup, a massive
formation of rock laid down
gradually between about
2.5 billion and 2.2 billion
years ago, precisely the
period when oxygen
began to accumulate in the
atmosphere. The Huronian Supergroup is 10 or 11
kilometers (six or seven
miles) thick and extends well below ground
<span>1. Each author uses non-English words and figurative language.</span>
<span>The central message of the poem, then, is quite a simple one, but it is dressed up in the memorable guise of a vivid supernatural tale which has helped to ensure its popularity to this day. Its a</span><span> moral message, warning against thoughtless and foolhardy actions such as the one the Mariner performs in shooting the albatross. The albatross had done the Mariner no harm at all; in fact it seems it had helped to guide his ship, so that his wanton killing of it appears even more inexcusable.</span>
