Correct option is B
The correct sequence
BADC forms a logical and grammatically correct sentence:
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(B) Before the trial → Establishes the context (when it happened).
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(A) began, 12 jurors were → Connects with (B) to indicate what happened before the trial began.
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(D) randomly selected from → Explains the action performed on the jurors.
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(C) a pool of candidates. → Completes the sentence by specifying where they were selected from.
Final sentence:
"Before the trial began, 12 jurors were randomly selected from a pool of candidates."