Question #N347

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?

Which choice correctly completes the sentence?
A. The three most important ingredients in a successful recipe are good ingredients, careful preparation, and a dash of creativity.
B. The three most important ingredients in a successful recipe are good ingredients, careful preparation and a dash of creativity.
C. The three most important ingredients in a successful recipe are good ingredients, careful preparation, and, a dash of creativity.
D. The three most important ingredients in a successful recipe are good ingredients, careful preparation; and a dash of creativity.