The correct answer is A. This is the case of using comma before a coordinating conjunction <em>and</em> because it links two independent clauses. We can observe that there two parts of this full sentence and each part is independent from each other. Both of them have their own subject and verb. Therefore, we are using a comma before <em>and</em>.
Hiya! I don't know if you use Quizletm but it has helped me a lot! Here is a link to it about this question! :)
https://quizlet.com/17715268/chapter-27-flash-cards/
1.A long walk to water
2. The clay
Thats all i got but i know those are right cuz i read them in 7th grade hope it helps
