What constitutes a balk when F1 is on the pitcher's plate?

A balk is called when a pitcher makes an illegal motion that deceives the base runners. In the case of option B, when F1 (the pitcher) raises both hands simultaneously while positioned on the pitcher's plate, it constitutes a balk because the act does not conform to the legal delivery of a pitch.

In baseball, the pitcher must follow specific guidelines while on the mound, and raising both hands can be interpreted as an intentional delay or an attempt to confuse the runners. This action disrupts the normal protocol of delivering a pitch, which is essential for maintaining the integrity of the game.

In contrast, stepping off the plate, contacting the plate, or a runner advancing while the pitcher prepares to pitch do not align as directly with the defined actions that would be deemed a balk, thereby making the choice of raising both hands the correct identification of a balk.