The phrase "citizen science project" is applied when citizens contribute to scientific researches.
Out of all the options, I would go with B. A Community Science Effort.
We can eliminate A because a regular community fair does not contribute to any scientific research and the last two, C and D do include science, but not any community work that would allow it to be called a citizen science project.
Please tell me if you need more help and I hope this helped you.
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