For this question you probably need to post the article your reading...
Optimism is all the rage. The enthusiastic cheer of motivational speakers has now received a seal of approval from scientists. So, apparently it's confirmed: Optimism<span> is good</span><span> for you.</span>
This is the answer , and I am so sure.
A. Short answer
http://www.dictionary.com/browse/objective-test
The neighbor has to be the antagonist, because the protagonist loved his dog very much and his neighbor killed his dog, the protagonist even called his neighbor evil, so I would go with C, the neighbor.