Which of the following practices can help prevent a dive emergency?

Regular equipment checks are essential for preventing dive emergencies because they ensure that all diving gear is functioning properly before a dive. This practice includes inspecting tanks for proper pressure, checking regulators for leaks, ensuring buoyancy control devices are operational, and verifying that all other essential equipment is in good condition. By maintaining equipment and addressing any issues before entering the water, divers can significantly reduce the risk of equipment failure, which can lead to emergencies such as running out of air or suffering equipment-related injuries.

In contrast, ignoring dive tables disregards important safety protocols necessary for managing decompression and preventing decompression sickness. Diving without a buddy eliminates a critical safety net, as having a partner can provide assistance in emergencies. Lastly, while managing psychological stress is vital for a diver's overall safety and performance, this practice does not directly prevent dive emergencies in the way that thorough equipment checks do. Regular checks should be part of a diver's routine to promote safety and minimize risks during dives.