When is the ball considered to be in A's backcourt with one player touching the division line?

The correct choice clarifies that the ball is considered to be in A's backcourt when one foot of a player is on the division line and the other foot is in the frontcourt. This situation indicates that the player has established their position in the backcourt because the ball's status is dependent on the player's closest point of contact with the court's boundaries.

In this case, the player’s foot placement defines their court area. If one foot is in frontcourt and the other on the division line, this signals that legally the player is still in the frontcourt, but the ball remains in the backcourt. The determination of whether the ball is in the backcourt relies on the player's positioning.

This concept is crucial in basketball rules as it affects the player's ability to make plays or advance the ball. Therefore, understanding this positioning is essential for players and coaches to make strategic decisions during the game.