What best describes the on-deck batter’s involvement?

• A. The batter currently at the plate.
• B. A substitute runner.
• C. The on-deck batter's duties are not defined.
• D. The next batter in the lineup; practice warm-up is often allowed.

Answer: (D)

The on-deck batter is the next batter in the lineup who will bat after the current hitter finishes. They stand in the on-deck circle and usually take practice swings and warm up so they’re ready when it’s their turn. That’s why this description fits best: the on-deck batter is the next to bat, and a practice warm-up is commonly allowed in that position. The other options don’t fit because they describe the current batter, a baserunner substitute, or claim the duties are undefined, which isn’t accurate—the on-deck batter’s role and prep routine are well defined.