Concept:The arrangement of planets by distance from the Sun helps identify the farthest planet.
Explanation:The eight planets in order from the Sun are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Pluto is now classified as a dwarf planet, not a major planet.
So Pluto is not counted as one of the eight planets.
Among the given options, Neptune is the farthest true planet from the Sun.
Mercury is the closest planet, and Mars is farther than Earth but closer than Neptune.
Answer:C. Neptune