Zhang, female, 50 years old. Clinically diagnosed as rheumatoid arthritis. In the past 10 days, the swelling and pain of the hands, feet and knee joints have increased, and the pain has been reduced after the activity, accompanied by discomfort symptoms such as loss of appetite and fatigue. The correct nursing care is

A. Maintain knee flexion
B. Take the supine position and keep the shoulder joint externally rotated
C. Use cold water to soak the swollen joints to relieve the swelling
D. Absolute bed rest
E. Put foot pads on the soles of the feet