Final answer:
Wetness is an indication that a hose needs to be replaced as it suggests leakage, while firmness and flexibility are normal, desirable hose traits.
Step-by-step explanation:
When checking the conditions of a hose, the indicator that would necessitate a replacement is D) Wetness. Hose conditions that are deemed unsuitable typically include signs of leakage, which can be evidenced by wetness. A firm hose (A) indicates a good condition, while flexibility (B) is necessary for the proper functioning of the hose. Warmth (C) can be a normal condition if the hose transports warm fluids.
Therefore, wetness due to leaks is a clear sign that the hose needs to be replaced to prevent further issues.Wetness is an indication that a hose needs to be replaced as it suggests leakage, while firmness and flexibility are normal, desirable hose traits.