For the set position, the pitcher shall stand with his:

• A. Entire non-pivot foot in front of a line extending through the front edge of the pitcher's plate and with his entire pivot foot in contact with any part of the pitcher's plate.
• B. Entire non-pivot foot in front of a line extending through the front edge of the pitcher's plate and with his entire pivot foot in contact and angled 45 degrees toward home plate.
• C. Non-pivot foot in front of a line extending through the front edge of the pitcher's plate and with his entire pivot foot in contact with or directly in front of and parallel to the pitcher's plate.
• D. Non-pivot foot in front of a line extending through the front edge of the pitcher's plate and with his entire pivot foot in the vicinity of the pitcher's plate.

Answer: (A)

In the set position, the non-pivot foot must be entirely in front of a line extending from the front edge of the pitcher's plate, and the pivot foot must be in contact with any part of the pitcher's plate. This setup ensures the pitcher is legally staged before delivering, with a fixed balance point and no movement off the plate before the pitch.

The choice that matches these requirements says the non-pivot foot is fully in front of that line and the pivot foot remains in contact with the plate. That aligns with the rule because there’s no obligation to angle the pivot foot, and the pivot foot just has to stay touching the plate, not necessarily in front of or parallel to it. The other options introduce extra constraints or vague language that aren’t part of the official set-position definition.