INTERNATIONAL ONLY Which of the following does NOT exhibit a yellow light?

Correct Answer: Option B — Towing vessels pushing ahead

Rule 24(c) requires a towing vessel pushing ahead to display masthead lights and sidelights, but not a yellow light. Conversely, purse seiners, air cushion vessels, and U.S. submarines are specifically authorized or required to display yellow lights under various conditions defined in Rules 23, 26, and Annex II.