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>
Explanation: in the last sentence the pronoun is placed where it clearly states whom they are speaking of. The second sentence could also be an answer but since it is misspelled I advise to just select the last sentence.
