[ Grammar ]
Correct the following text by inserting one comma.
When Meb Keflezighi crossed the finish line at the 2014 Boston Marathon he became the first American runner to win the race in over thirty years.
A. Place a comma after the word “line.”
B. Place a comma after the word “Marathon.”
C. Place a comma after the word “2014.”
D. Place a comma after the word “race.”

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