Which of the following factors can increase the risks of decompression illness?

The accurate selection reflects the understanding that various factors can collectively elevate the risks associated with decompression illness. Each factor listed plays a role in increasing the likelihood of this condition, which occurs due to the formation of nitrogen bubbles in the body when a diver ascends too quickly or improperly.

Environmental pressure changes can significantly impact a diver's risk by altering the nitrogen absorption in the body. When descending or ascending, the pressure around a diver fluctuates, which can affect how nitrogen is off-gassed or absorbed.

The length of the dive is another crucial factor, as longer dives increase the amount of nitrogen that can accumulate in a diver's tissues. Extended exposure at depths can make it more challenging for the body to safely eliminate this nitrogen when ascending.

Temperature fluctuations can also influence decompression risk. Cold temperatures can constrict blood vessels, potentially limiting the body's ability to circulate blood efficiently and thus, to off-gas nitrogen effectively. Warm temperatures tend to promote vasodilation and possibly lead to increased nitrogen absorption, making both extremes potentially hazardous.

Given that all of these factors contribute to the complexities of decompression theory, the choice acknowledges that the interplay of these various elements can compound the risks associated with diving, leading to a greater potential for decompression illness if not managed