In which scenario is a catch not considered valid when a fielder drops a fly ball?

A catch is not considered valid in the scenario when the ball bounces off the ground first. According to the rules governing catches in baseball and softball, for a catch to be valid, the fielder must securely obtain possession of the ball while it is in the air. If the ball strikes the ground before the fielder makes contact with it, the play is deemed a no catch, regardless of whether the fielder eventually obtains the ball afterward.

In the context of the scenario presented, option A refers to F8 dropping the ball while falling, which may still be a valid catch if the initial contact with the ball was made before it hit the ground. Options B and C present situations where the catch may still be considered valid depending on the circumstances surrounding the drop or removal from the glove.