Final answer:
The correct position to check the breathing of an unresponsive victim with a possible spinal injury is the supine position.
Step-by-step explanation:
The correct position to check the breathing of an unresponsive victim with a possible spinal injury is the supine position. In supine position, the person is lying face-up with upper limbs, including palms, touching the sides and lower limbs touching at the sides. This position allows for a clear view and easy assessment of the victim's breathing.