Which scenario would result in a base hit?

A base hit is defined as a hit that results in the batter reaching at least first base safely, allowing him to advance because of the quality of the contact with the ball. A hit that reaches the outfield and cannot be fielded qualifies as a base hit because it typically means the ball has crossed the infield and is positioned in such a way that it is difficult or impossible for fielders to make a play on it. This situation allows the batter to safely reach base, and possibly advance further depending on the circumstances of the play.

In contrast, when a hit is caught in the air, it is considered a catch, which results in the batter being out. Any hit that bounces back to the pitcher is generally easy to field and does not result in the batter reaching base, making it not a base hit. A hit that goes straight up in the air is also typically caught, leading to an out rather than allowing the batter to reach base. Therefore, the scenario where the hit reaches the outfield and cannot be fielded is the only one that meets the criteria of being a base hit.