When B5 is an improper batter and R3 safely reaches home, does R3's run count?

When considering the situation where B5 is an improper batter and R3 safely reaches home, the correct answer indicates that R3's run counts. This is based on the rules governing improper batters and the conditions under which runs can be scored.

In cases like this, the overarching principle is that a run can still score despite the batter's improper status, as long as the play is otherwise valid. The critical factor here is that R3 reached home safely while the play was ongoing, not impacted by B5's improper status. The run is considered valid and counts toward the team score.

The other options relate to additional conditions or stipulations that are not applicable in this scenario. They suggest various situations in which the scoring might be conditional or nullified, which do not align with the established rules regarding scoring runs in the event of an improper batter situation. Therefore, the rules affirm that R3's run is valid and should be counted, reinforcing the understanding that the integrity of the play itself supersedes the improper designation of the batter.