Final answer:
The safety card should be held in front of the chest during a safety demonstration for optimal visibility and communication.
Step-by-step explanation:
During the safety demo, the correct position to hold the safety card is C) In front of your chest. This allows for clear visibility for all passengers while ensuring that the flight attendant or demonstrator's face remains visible for any additional instructions or communication. Holding the card at this position makes it easy to reference and point out specific features on the card as they are explained during the safety demonstration.