Final answer:
The example of a stage direction from the choices provided is C. (winks at Fiona), as stage directions are non-dialogue instructions for the actors and stage crew, often enclosed in parentheses or italicized in a script.
Step-by-step explanation:
An example of a stage direction in a play is an instruction to the actors and production team that is not spoken dialogue but provides guidance on the movement, actions, or set design that should occur onstage. In the options provided, Letter C. ((winks at Fiona)) is an example of a stage direction. Stage directions are typically written in italics or enclosed in parentheses within the script, guiding the director, actors, and stage crew on what should be happening visually and aurally during a performance. They help in conveying the physical life of the play beyond the dialogue.
Reading stage directions is essential for understanding the full context of a play and how characters interact with each other and their environment. These directions can include information about character movements, emotional responses that do not involve dialogue, the arrangement of props and set pieces, and other non-verbal cues that contribute to the storytelling.