Which of the following describes the process of decompression?

Decompression refers to the gradual ascent to the surface after a dive that allows for the safe elimination of inert gases, primarily nitrogen, that accumulate in the body under increased pressure. While underwater, divers breathe gaseous mixtures that can contain higher levels of nitrogen due to the increased pressure at depth. As divers ascend, the pressure decreases, and the nitrogen that has dissolved in the body's tissues must be released slowly to avoid forming bubbles, which can lead to decompression sickness (also known as "the bends"). Therefore, the correct description of decompression is ensuring a controlled ascent allows for this gas elimination to occur safely.

The other options do not accurately describe decompression. A sudden ascent can lead to serious health risks, including decompression sickness, because it does not provide the necessary time for the body to off-gas the accumulated nitrogen. Adjusting buoyancy underwater is related to maintaining neutral buoyancy rather than the process of decompression itself. Finally, while navigating underwater currents is relevant to dive safety and planning, it does not speak to the physiological process involving gas elimination after a dive.