Question #N891

Which of the following sentences correctly uses a comma to separate a nonrestrictive clause from the rest of the sentence?
A. The small town, nestled in the valley, was known for its charming atmosphere.
B. The small town nestled in the valley was known for its charming atmosphere.
C. The small town, nestled in the valley was known, for its charming atmosphere.
D. The small town nestled in the valley, was known for, its charming atmosphere.