Final answer:
The Dorsal Column-Medial Lemniscus Pathway is responsible for proprioception, 2-point discrimination, and graphesthesia in the trunk, neck, and upper extremities, as it carries information about touch and proprioception, differing from the spinothalamic tract which carries pain and temperature sensations.
Step-by-step explanation:
The tract responsible for sensory information for the trunk, neck, and upper extremity proprioception, 2-point discrimination, and graphesthesia is the Dorsal Column-Medial Lemniscus Pathway (b). This tract primarily carries information about touch and proprioception and is part of a somatosensory system that ascends to the brain where it decussates in the medulla. Unlike the spinothalamic tract, which is responsible for pain and temperature sensation and crosses the midline in the spinal cord at the level it enters, the dorsal column system ascends ipsilaterally to the source of stimulus before crossing over in the medulla. Testing sensory input related to these functions can provide information on whether these ascending pathways are functioning properly.