Answer:
3.
Explanation:
The quote from the Benjamin Franklin's autobiography suggest that the main motivation behind building the library was to improve the lives of his countrymen.
Benjamin Franklin was a major proponent of education and reading, thus establishing a Library Company in 1731 (as written in Franklin's biography).
The excerpt from Franklin's autobiography describes the true purpose of building the library. It was for the betterment of his fellowmen. He writes that after people started reading and educating themselves even the most common tradesmen and farmers attained intelligence as the other gentlemen of the country.
Therefore, option 3 is correct.