8.Kara pushes her big brother on a swing at the playground. After he gets off the swing, her little brother gets on. Kara finds that it is easier to push her little brother than it was to push her big brother. What is the MOST LIKELY reason for this?*
A. a smaller Mass always moves faster than a larger Mass
B.a smaller Mass always move slower than a larger Mass
C.less force is needed to move a larger Mass the same distance
D.more force is needed to move a larger Mass the same distance ​