Heat application is the most effective method for relieving back pain during labor. It helps relax muscles and reduce pain. Other methods like cold application and complete bed rest are not as effective. ;
The most effective method to relieve back pain during labor is heat application, as it helps relax muscles and reduce pain. Options like cold application, supine position, and complete bed rest are less effective for labor-related back pain. Therefore, the correct choice is B. Heat application.
;