Choose the sentence that uses commas correctly
1.
O a. While in Boston, I visited Fenway Park, Bunker Hill, and Old North Church.
O b. While in Boston, I visited Fenway Park Bunker Hill, and Old North Church.
O c. While in Boston, I visited Fenway Park, Bunker Hill and Old North Church.
2.
O a. Avocados, the key ingredient of guacamole are a good source of fiber.
O b. Avocados, the key ingredient of guacamole, are a good source of fiber.
O c. Avocados the key ingredient of guacamole are a good source of fiber.