For the next several questions, consider the velocity vs. time graph below for the motion of an athlete
running through an obstacle course from left to right. The motion is divided into several time intervals, each
labeled with a letter.

During which time interval\(s\), if any, are the forces acting upon the athlete unbalanced? List all that apply.

• A
• B
• C
• D
• E
• F
• G
• H