What type of test must all first-time drivers pass at TLC?

The correct choice is the knowledge (written) test covering road signs and traffic laws. This test is essential as it ensures that first-time drivers have a solid understanding of the rules of the road, including the meanings of various road signs and the traffic laws applicable in Guam. It serves as a foundational step to ensure that new drivers possess the necessary knowledge to drive safely and responsibly.

Understanding the road signs and traffic laws is crucial for safe driving practices, as this knowledge helps prevent accidents and ensures compliance with traffic regulations. This test is designed to assess the driver's theoretical knowledge before they can advance to the practical elements of driving, such as the skills or vision tests, which are typically required at a later stage in the licensing process.