Under what condition will the batter be declared out as a result of interference?

The batter is declared out due to interference when a third-base coach interferes with a foul fly ball. This situation occurs because the third-base coach, as a representative of the team, is not permitted to interfere with the play of the game. If their actions prevent a fielder from catching a foul ball, the batter is ruled out due to the interference created by the coach's actions.

In baseball, interference is defined as an act by a player or a coach that hinders the defense or alters the natural course of play. Since the third-base coach is actively involved in guiding the players on the field, any interference caused by their actions, particularly during an attempt to catch a fly ball, directly impacts the defensive team and therefore results in the batter being called out.

The other conditions listed do not meet the criteria for declaring a batter out due to interference, as they either relate to actions that do not involve interference with the fielders or do not impact the play in such a manner. For example, a pitcher stepping off the plate does not relate to interference, nor does a runner's failure to tag up. Missing a coach's signal is also not classified as interference and does not affect the defensive team's ability to make a play.