SAT English Practice Question

In the following sentence, the convention being tested is the use of commas to separate items in a series. The three most important ingredients in a successful recipe are good ingredients, careful preparation, and a dash of creativity. Which choice correctly uses commas in a series to separate these three items?

1. A.The three most important ingredients in a successful recipe are good ingredients, careful preparation, and a dash of creativity.
2. B.The three most important ingredients in a successful recipe are good ingredients, careful preparation and a dash of creativity.
3. C.The three most important ingredients in a successful recipe are good ingredients, careful preparation, and, a dash of creativity.
4. D.The three most important ingredients in a successful recipe are good ingredients, careful preparation; and a dash of creativity.