[ Grammar ]
Identify the best option of past perfect.
A. Before they had arrived at the dinner party, Chad and Bianca have stopped to buy flowers.
B. Before they arrived at the dinner party, Chad and Bianca had stopped to buy flowers.
C. Before they had arrived at the dinner party, Chad and Bianca had stopped to buy flowers.
D. Before they arrived at the dinner party, Chad and Bianca had stoped to buy flowers.

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