The question seems to be asking about a specific point at which a change in dynamics occurs, but without additional context about what "dynamics" refers to (e.g., in a mathematical sequence, a scientific experiment, or a piece of literature), it's difficult to provide a definitive answer.
If this is related to a specific field, such as physics, music, or literature, please provide more details for an accurate response. Otherwise, I cannot determine which of the options is correct.