What spacing is required for the start of interruptions in a colloquy?

The spacing required for the start of interruptions in a colloquy is 15 spaces from the left margin. This format is established in the guidelines for court reporting to ensure clarity and consistency. By starting interruptions at this specific distance, it visually distinguishes the speaker's dialogue from the ongoing narrative of the conversation, helping the reader to follow the dialogue more easily. This practice helps maintain an organized structure within the transcript, allowing for better readability and comprehension of the dialogue flow.

The other spacing options do not conform to the standard set by court reporting guidelines for interruptions, which is why they are not valid choices.