Which answer corrects the shift in verb tense in the sentence?

Before Sarah left for camp, she says good-bye to her friends.

ABefore Sarah left for camp, she said good-bye to her friends.

BBefore Sarah is leaving for camp, she says good-bye to her friends.

CBefore Sarah will leave for camp, she says good-bye to her friends.

DBefore Sarah leaves for camp, she had said good-bye to her friends.