Which sentence uses punctuation correctly?

AHis oldest sister, Anna Marie started taking college courses.
BHis oldest sister Anna Marie started taking college courses.
CHis oldest sister Anna Marie, started taking college courses.
DHis oldest sister, Anna Marie, started taking college courses.

Verified Answer :

the answer is D.His oldest sister, Anna Marie, started taking college courses.

Answer: D.

Explanation: Sentence A lacks a closing comma for the appositive phrase "Anna Marie," sentence B lacks both the opening and the closing comma, and sentence C lacks the opening comma for said appositive phrase (the latter results in an illegal comma that divides the subject from the verb).