Final answer:
The fee for swearing in a witness is $2.50 (option C).
Step-by-step explanation:
In the context of law, an individual may be required to take an oath or make a solemn affirmation before providing testimony as a witness in a legal proceeding. This process is known as swearing in a witness. The fee for this service is typically set by the court or jurisdiction, and in this case, it is $2.50. Normally, fee schedules for court services like swearing in a witness are established by local, state, or federal court rules and can be different depending on the court's jurisdiction. The fee for swearing in a witness is $2.50 (option C).