The correct answer is C. Building a community garden allows people to work together to clean up and revitalize unsightly lots and enhance neighborhoods.
Explanation:
Formal writing such as the one used in academical articles or informational text is characterized by the use of academic formal langue that includes using technical words, being objective, and using grammar strictly. Additionally, formal writing avoids slang, contractions, and words that express personal prejudices.
According to this, the sentence that uses formal style is "Building a community garden allows people to work together to clean up and revitalize unsightly lots and enhance neighborhoods" because the language in this is academical as it uses words such as "revitalize", "enhance" and "unsightly" that are formal. Also, different from others this text does not include contraction or words such as "total mess", "cool" or "big flop" that are informal and should be avoided.
