The batter is declared out when:

• A. He intentionally deflects a foul ball that has a chance of becoming fair.
• B. He hits the ball foul while either foot or knee is touching the ground completely outside the lines of the batter's box.
• C. He disconcerts the pitcher by stepping from the box on one side of home plate to the box on the other side home plate while the pitcher is in position ready to pitch.
• D. All of the above.

Answer: (D)

In NFHS baseball, the batter can be ruled out for actions that unfairly affect the course of the pitch or the legality of the at-bat. Each of these three scenarios fits that idea.

Intentionally deflecting a foul ball that could become fair is treated as interference with a live ball. The batter is out because touching a foul ball in that way unlawfully alters its potential to become a fair ball, and the umpire must call the batter out to maintain fair play.

Hitting a foul ball while one or both feet or knees are completely outside the batter’s box is an illegal batting action. The batter must be in the box to legally bat; going outside the box and making contact with the ball is an out under the rules.

Disconcerting the pitcher by stepping from one side of home plate to the other while the pitcher is in position ready to pitch is an intentional act to disrupt the pitcher. That act is prohibited, and the batter is declared out for it.

Since each of these actions results in an out, the correct overall conclusion is that all of the above situations cause the batter to be declared out.