What problem does water in an excavated trench create?

When water accumulates in an excavated trench, it creates unstable soil conditions, which is why the answer is B. Water can saturate the soil, reducing its cohesion and internal friction, leading to a higher risk of soil collapse or sliding. This instability is particularly concerning for safe work practices as it may compromise the integrity of the trench walls, posing a danger to workers and equipment.

In contrast, increased stability, easy excavation, and less erosion do not accurately describe the effects of water in a trench. In fact, water in the soil often contributes to erosion, undermines stability, and can make excavation more difficult due to the added moisture weight and challenging conditions. Therefore, understanding the impact of water on soil stability is essential for maintaining safety and operational efficiency in excavation work.