What should you avoid while diving on the bottom?

The correct answer highlights that sinking should be avoided while diving on the bottom. When divers sink excessively, they may run the risk of damaging sensitive marine environments, such as coral reefs or delicate seabeds. Additionally, a rapid or uncontrolled sinking can lead to issues with buoyancy control, which is crucial for maintaining a safe position in the water column. Proper buoyancy allows divers to move around the underwater environment without disturbing the ecosystem or accidentally injuring themselves.

Floating, drifting, and raising arms, while they can have implications for buoyancy or visibility, do not inherently pose the same risk as uncontrolled sinking, which directly affects the diver's safety and the surroundings. Maintaining a controlled position near the bottom is essential for both environmental protection and personal safety during a dive.