What is one of the primary causes of drowning related to swimming abilities?

The choice indicating weak or non-existent swimming skills is a primary cause of drowning because individuals who lack adequate swimming abilities often underestimate the risks associated with being in or near water. Those who cannot swim well may panic in situations where they find themselves in deep water or unexpectedly in distress, leading to potential drowning incidents. Strong swimming skills are essential as they empower individuals to handle emergencies in the water, enabling them to float, tread water, or swim back to safety.

The other options, while they may contribute to unsafe situations, do not directly relate to swimming abilities in the same way. For instance, failure to wear sunglasses does not impact a person's ability to swim or manage water safety. Similarly, while swimming in high tides and being in crowded areas can increase risks, they are external factors that may overwhelm even skilled swimmers, rather than directly linked to a lack of swimming skill. Thus, strong swimming abilities are a fundamental safety measure against drowning incidents.