Read the passage.

benjamin franklin’s legacy

benjamin franklin was a man of vision. he was an inventor who created bifocals, a new kind of eyeglasses that people still wear to see better. benjamin franklin was also concerned about public welfare. he established the united states postal service and the first city hospital in america. in philadelphia, he organized the police department, the fire department, the public library, and a university. he also write the declaration of independence and the constitution. today, millions of people benefit from the ideas that benjamin franklin had more than two hundred years ago.

what is the main idea of this paragraph?

a- benjamin franklin was a great inventor.
b- benjamin franklin’s ideas still affect the lives of people today.
c- benjamin franklin did lots to the people of philadelphia.
d- benjamin franklin was a great politician.