What action does F1 take in Situation F that results in a balk?

In the context of baseball rules, a balk is defined as an illegal motion made by a pitcher while on the mound that can deceive the base runners. The actions that can lead to a balk include any unnatural or deceptive movement that disrupts the normal cadence of the pitcher's delivery.

In this scenario, both actions performed by the pitcher F1—nervously tossing the ball in his glove and removing the ball from the glove—can be interpreted as deceptive behaviors. Tossing the ball nervously may create an illusion of a pitch being initiated, while removing the ball from the glove can be seen as an attempt to feign a throw or distract base runners. These actions may confuse or mislead runners, which is a key aspect of what constitutes a balk.

When combined, these actions clearly violate the spirit of the pitching rules, thus resulting in a balk being called. Therefore, the answer that encompasses both of these actions as leading to the balk is the correct choice.