Answer:
A) Fermat's Last Theorem was finally proven after 358 years of effort in 1994 by Cambridge professor, Andrew Wiles.
Explanation:
Because why not
It could be to help the environment or they don’t have enough money for another alternative.
The second choice is a fragment, not a complete sentence.
I believe the correct choice is number one, because if you turn the sentence around, it answers the question of why the crowd is gathered. You may want to confirm on the website chompchomp.com (Grammar Bites).
Um what...? Do u need help