Final answer:
For a patient who is immobilized, a nurse assessing body alignment will typically use the supine position, where the patient lies on their back with the face upwards.
Step-by-step explanation:
The nurse assessing body alignment for a patient who is immobilized will typically use the supine position. In this context, the supine position refers to the patient lying on their back with their face oriented upwards. This position is often used for physical examinations, as it allows for natural alignment of the body's structures and is comfortable for the patient who cannot move independently. The use of positioning supports or removing pillows from under the patient's head might be additional measures to maintain proper alignment, but in the question's context, the simple supine position without specifying additional supports seems most appropriate.