Which call does the umpire make when F2 obstructs while R3 is trying to score on a squeeze play?

When F2 obstructs R3 during a squeeze play as he is attempting to score, the umpire's appropriate call is to declare a dead ball and award R3 home. This decision is rooted in the rules regarding obstruction, which state that when a defensive player impedes the progress of a runner without the ball, it constitutes obstruction.

In this case, since F2's actions clearly impacted R3's ability to score, the rule protects the runner by stopping play rather than allowing the obstruction to influence the outcome of the play. By awarding R3 home, the umpire ensures that the obstruction is duly penalized and that the runner is not unfairly denied the opportunity to score due to the obstruction. This ruling also reinforces the principle of player safety and fair play, which are paramount in the sport.

The other options do not correctly address the implications of the obstruction, leading to outcomes that do not reflect the protections afforded runners in such situations.