Final answer:
The client understands the teaching about using crutches if they state they will keep crutches on the side opposite of the injured leg to distribute weight and maintain balance.
Step-by-step explanation:
The question is centered around the proper use of crutches and understanding balance and stability when one's mobility is compromised. The correct statement indicating that the client understands the teaching about using crutches would be "I'll keep the crutches on the side opposite to my injured leg." This is the right way to use crutches as it helps to distribute the weight away from the injured leg and maintains balance by widening the base of support. Other statements like placing weight on the underarm pads or leaning forward while using crutches may lead to improper use or balance issues. It's also important to make sure the crutches are at the correct height; if crutches are not properly adjusted they can cause discomfort or issues with stability and balance.