Question

Which is correct? A.The entire neighborhood was grateful to Thalia because she started a beautiful community garden in a vacant lot that had been an eyesore. B.The entire neighborhood was grateful to Thalia. Because she started a beautiful community garden in a vacant lot that had been an eyesore. C.The entire neighborhood was grateful to Thalia, because she started a beautiful community garden in a vacant lot that had been an eyesore.

Answer 1

C is the only option with correct punctuation all around, including the comma after "Thalia" to accentuate a brief pause in the sentence. Therefore, C is the correct answer.
Hope that helped =)

Answer 2

A is correct because you shouldn't put any punctuation before 'because' so it shouldn't be at the beginning of the sentence or after a comma, etc.