Final answer:
The end position for shoulder D1 flexion is the forearm. Option c is correct.
Step-by-step explanation:
Shoulder D1 flexion refers to a diagonal movement across the body. The end position for this movement is the forearm.
It involves a combination of shoulder flexion and forearm supination. Shoulder flexion is the lifting of the arm forward and upward.
Forearm supination is the rotation of the forearm so that the palm faces upward. Together, these actions create a diagonal flexion movement. The result is the forearm reaching across the body during the D1 flexion. This movement is often used in rehabilitation exercises and physical therapy.
The D1 flexion helps improve coordination and strength in the shoulder and forearm. Understanding and practicing such movements are crucial for maintaining optimal range of motion and functionality in the upper extremities.
Hence, option c is correct.