Which of the following is a critical factor in preventing decompression sickness?

Utilizing controlled ascent rates during all dives is a critical factor in preventing decompression sickness because it allows the body to safely eliminate nitrogen that has been absorbed during the dive. During a dive, as a diver descends and spends time at depth, nitrogen from the breathing gas is absorbed by the body's tissues. If a diver ascends too quickly, the rapid reduction in pressure can cause nitrogen to form bubbles in the body, leading to decompression sickness, often referred to as "the bends."

By maintaining a controlled ascent rate, divers can ensure that the nitrogen has enough time to safely release from their tissues into the bloodstream and be exhaled, significantly reducing the risk of bubbles forming. Additionally, this practice often includes following safety stops, typically at around 15 feet for a few minutes, which further aids in the off-gassing process and enhances safety.

Other options, such as conducting deep dives without safety stops or ascending too quickly, directly contribute to an increased risk of decompression sickness, as they violate the principles of safe diving practices. Engaging in multiple dives without adequate surface intervals can also result in cumulative nitrogen absorption, increasing the likelihood of decompression illness. Thus, controlled ascent strategies are essential for divers to manage their exposure to pressure changes