Step 1: The range of a gunshot wound is judged by the marks produced by the products that leave the muzzle - flame (burning), smoke/soot (blackening), and unburnt/partially burnt powder grains (tattooing or stippling) - in addition to the bullet itself.
Step 2: Here the wound shows only an abrasion collar (AC, produced by the bullet indenting and grazing skin on entry) and a grease/dirt collar (GC, wiped off dirt and lubricant from the bullet). Both are produced by the bullet at ANY range and carry no range information by themselves.
Step 3: The absence of tattooing, soot, and burning is the decisive finding. Powder tattooing is seen up to roughly 60 cm (about 2 feet) and soot up to roughly 30 cm; beyond the maximum travel of powder grains, none of these accessory marks reach the skin.
Step 4: Therefore the shot was fired beyond the range at which gunpowder can reach the target - a distant (far) range wound, showing only AC and GC.
Step 5: Why the others are wrong - contact wounds show muzzle imprint, soot, and burning; close range shows dense blackening and burning; near/intermediate range shows powder tattooing. None of these features are present here.
Key fact: Only abrasion + grease collar with NO tattooing/soot/burning = distant range firearm wound.