Answer:
A space cushion is a certain amount of distance you keep between you and the car in front of you that allows you to easily maneuver in any condition. A typical space cushion in perfect conditions would be about 3 seconds between you and the car in front of you.
Explanation:
B. Weighted GPA
You see the unweighted is considered the college GPA and removes all AP, IB, or Honors clasess and puts all college applicants on the same level, cumulative GPA is wrong and doesn't make any sense with relation to the question, and the semester GPA wouldn't technically include the extra 10 points that these classes give.
I'm thinking Lack of Motivation. I'm going to double check though for you.