Answer:
The answer is sentence A.
A proper noun is just a specific noun and starts with a capital letter. Some suggestions: Honda Civic. McDonald's. (Your name). Texas. Grand Theft Auto. The Hunger Games. (Your teacher). Time Magazine. Red. Despicable Me. I hope this helps :)
Answer:
Before the rain; the clouds turned dark gray.
Explanation:
For it to be properly worded<em>, </em>it would be <em>" Before the rain, the clouds turned dark gray " </em><em>or </em><em>" The clouds turned dark gray </em><em>before </em><em>the rain ". </em>
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<em>p.s. </em>
<em>the other answer explains it a bit clearer, showing to remove the " ; "</em>