What is the consequence if B3 rounds first base while F9 throws the ball to first base on a trapped ball?

When B3 rounds first base and F9 throws the ball to first base on a trapped ball, the correct consequence according to baseball rules is that B3 is awarded second base after legally touching first base. This situation arises because a trapped ball is considered a dead ball, meaning runners can advance only after touching all required bases due to the action of the play.

In this scenario, B3 has the opportunity to advance because he legally touched first base before the play was called dead. Therefore, he is entitled to proceed to second base as he has successfully completed the requirement of touching first. The other answers do not accurately reflect the rules governing this situation; for instance, if B3 were awarded only first base, it would ignore the clear opportunity for advancement that he has after touching the base. Consequently, the correct interpretation leads us to understand that B3's proper action in rounding first would allow him to advance safely to second base after meeting the conditions of the play.