The correct answer is a.
R1's out on the play stands. Because the appeal was made before the next pitch, B2 is also out. Further, because B2 was an unreported sub, he is disqualified.
If a pitch was thrown and then the defense appealed B2, he would be disqualified, but he would not be out. A substitute would run for him.
If the offense notified the umpire of the substitution before the defense appealed, B2's entry would have become legal.
See sections 4-6 and 4-7.
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greymule
More whiskey—and fresh horses for my men!
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