Correct Placement of Commas in a Sentence

Determine which answer choice shows the correct placement of commas in the sentence.

A) Margaret Mitchell, the author of the famous book Gone With the Wind, is buried in Oakland Cemetery.

B) Margaret Mitchell is the author of the famous book Gone With the Wind who is buried in Oakland Cemetery.

C) Margaret Mitchell, who is buried in Oakland Cemetery is the author of the famous book Gone With the Wind.

D) Margaret Mitchell who is buried in Oakland Cemetery, is the author of the famous book, Gone With the Wind.

The sentence with the best comma placement is answer A, "Margaret Mitchell, the author of the famous book Gone With the Wind, is buried in Oakland Cemetery."