The Correct choice is C. Neptune !
since Neptune is the farthest planet from sun in our solar system, it has to cover the longest orbit.
Seed plants are an evolutionary advantage because A) SEEDS ALLOW THE TRANSPORT OF WATER AND NUTRIENTS.
Seeds contain an embryo that allows them to remain dormant until such time that their environmental conditions improve before they can grow and develop into plants.
These seeds help the plants decrease their dependency on water to help in their reproduction.