Sambar deer are physically incapable of digesting meat. Yet sambar deer have been reported feeding on box turtles after killing them. Which one of the following, if true, best resolves the discrepancy above? ['Sambar deer kill box turtles only occasionally.', 'Box turtles are much slower and clumsier than are sambar deer.', 'Sambar deer eat only the bony shells of box turtles.', 'Box turtles sometimes compete with sambar deer for food.']