I'm not sure but I believe it is because Sancho Panza will not receive any wages. But you may want to wait for someone who may have already answered this question or read the entire book, as english and literature aren't my strongest points.
The chemicals had caused the eruption of smoke that filled the air. (Not sure if this is 100%)
Answer:
The third one; He received a patent for his invention.
Explanation:
The first sentence has a proper noun; Alexander Graham Bell
The second sentence also has a proper noun; Super Bowl
And the fourth has a proper noun; Farnsworth
The answer is d! hope it helped!