Answer :
The answer is D.
Here are the other 3 incorrect sentences with their corrections so you can compare to see the difference:
A) WERE the people playing soccer at the park?
B) Near the coast LIVE several species of bird.
C) In the sky WERE few clouds.
Here are the other 3 incorrect sentences with their corrections so you can compare to see the difference:
A) WERE the people playing soccer at the park?
B) Near the coast LIVE several species of bird.
C) In the sky WERE few clouds.