The answer is
D.<span>The storm—it was the worst in years—caused several power outages.</span>
To vote for local politics that will help the community in my opinion. To volunteer around my area to help the area flourish. Have my pets fixed or kept in an enclosure they can’t get out of to help prevent invasive species.
The reasoning of why shouldn’t be completely answered with a time frame
Paired conjunctions
Either......or
Neither......nor
Not only.....but
Iwill go either to Rio or Bahia on my vacation
Neither John nor Mary speaks French
Not only does he speak French,but also German
An abstract noun is a noun that you can't feel, hear, taste, smell, and see. Like hope. A concrete noun is a noun that you CAN feel, hear, taste, smell, and see.
So the abstract noun in this sentence is not choir, but harmony.
hope it helps!