Hello, sorry this is a little late, but hopefully it can help others who visit this question!
I believe the correct answers to your question would be:
Valid Reasons: "Barring motor vehicles from the central area will help reduce air pollution and noise pollution." and "Studies predict that shopping activity in the area will increase if cars are prohibited."
Invalid Reasons: "At a dinner I attended recently, someone complained loudly about the number of cars in the shopping district." and "Many cities of our size have downtowns that are only active during workdays, not on evenings or weekends."
I can confirm these answers are 100% correct!
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Answer:
C. Grammar and punctuation
A passive voice is whenever you make the object of an action the subject of the sentence you are writing. (Ex: Why was the road crossed by the chicken?)
An active voice is whenever you make the subject of the sentence doing the verb's action. (Ex: The chicken crossed the road.)
