Final answer:
For an elevated entry point and clear water with a known depth, the most suitable entry is a Controlled and Safe Entry, which minimizes injury risk.
Step-by-step explanation:
The most appropriate entry for areas with a slightly elevated entry point and clear water with known depth and bottom free from obstacles is c. Controlled and Safe Entry.
This method ensures the individual enters the water in a manner that minimizes the risk of injury.
A controlled entry involves the swimmer using their hands and arms to protect the head and neck while entering the water feet first at a slower rate, allowing for a reaction to unseen hazards.
Contrarily, a clear and safe entry would be too vague, and a known depth entry ignores the elevated aspect, while a low elevation entry is more specific to the height from which one is entering rather than the manner of entry.