Final answer:
Speaker labels are formatted in bold, followed by a colon and a space. The correct format assists in script organization and dialogue clarity.
Step-by-step explanation:
Speaker labels must be written in bold, followed by a colon and a space. The correct answer to the question is C) Colon, hyphen. In scriptwriting and dialogue formatting, when a speaker's name or a character's name is labeled before their dialogue, it is customary to use a bold label followed by a colon. The colon introduces the dialogue, which is then separated from the label by a space. This standard formatting helps to clearly identify who is speaking and to keep the script organized and reader-friendly.