Final Answer:
K-3 of amputees requires a variable cadence to keep up with lifestyle demands.
The correct option is 3
Explanation:
Amputees classified under K-level 3 (K-3) necessitate a variable cadence to match the demands of their lifestyles. K-3 individuals typically lead moderately active lives, engaging in various activities across different terrains and environments. Their prosthetic needs often involve accommodating different walking speeds and diverse physical activities.
So, the correct option is 3.