The united states mint makes coins. its main task is to make sure the people of the nation have enough coins to carry on daily business. in addition to coins for commerce (buying and selling), the united states mint also makes other coins and medals for collectors.

where is the mint? there are six places around the country that make up this federal agency. each one is called a "facility."

a facility is a place or building set up for certain reasons. the united states mint has six facilities with different purposes. from headquarters in washington, dc, the director of the mint oversees the facilities in philadelphia, denver, san francisco, and west point, and fort knox.

the word facility is repeated several times in the passage. what is the author's purpose for repeating it?
a) to add to a reader's vocabulary
b) to clarify that the mint has several locations
c) to clarify that the mint is a physical building
d) to tell the reader what to look for when visiting the united states mint