Final answer:
In the supine position, the patient lies flat on the back with arms at the sides and legs extended straight.
Step-by-step explanation:
In the supine position, the patient lies flat on the back with the arms secured at the sides and with legs extended straight. This position is commonly used in medical settings for various examinations and procedures. The supine position is one of the standard patient positions that is defined in relation to the anatomical position of the body, which is an upright stance with upper limbs to the side of the body and palms facing forward. Being supine means that the person is facing upward. In contrast, the prone position describes a person who is lying face down. As such, option A) Legs extended straight is the correct completion to the statement.