What must drivers do for their seatbelts before driving?

Answer: B — Fasten the seatbelts

Fastening the seatbelt before driving is a crucial safety measure mandated by law as it significantly enhances passenger safety in the event of an accident. Seatbelts are designed to keep occupants securely in their seats, reducing the risk of ejection and minimizing injury by distributing the force of a collision across the stronger parts of the body. By ensuring that seatbelts are fastened, drivers take an essential step in protecting themselves and their passengers, promoting a safer driving environment. While checking for malfunctions and adjusting for comfort are important, the primary requirement before starting to drive is to have the seatbelts securely fastened, aligning with legal regulations and safety best practices.