Final answer:
The supine position has the person lying on their back with face up, but the exact position described, with head, chest, and knees at the same level, does not fit the standard supine position and is not sufficiently specified among the given options.
Step-by-step explanation:
The lying-down position in which the patient's head, chest, and knees are at the same level is known as the supine position. In a supine position, the person is lying on their back with their face upward, and the body's upper limbs, including palms, are typically touching the sides, as are the lower limbs. This contrasts with the prone position, where the person would be lying face down. While the supine and prone positions are common references during physical examinations, it does not appear that the specific position described exactly fits either category; none of the provided options mention the knees being at the same level as the head and chest. Variations of body positioning such as sitting or kneeling might also be considered for different medical evaluations or procedures.