In the provided graph representing the position of a moving car along a straight road over time, identify any time intervals during which the car's velocity remains constant.

• A. constant between t = 35.0 s and t = 50.0 s
• B. constant between t = 10.0 s and t = 30.0 s
• C. constant between t = 20.0 s and t = 40.0 s
• D. Velocity is not constant at any time.

Answer: (D)