Which response accurately describes a balanced force?

Question 7 options:

a. A 25-N force acts on the left side of the marble at the same time as a 25-N force acts on the right side of the marble.


b. A marble resting on the sidewalk suddenly begins to roll downhill without being touched.


c. A 2-N force presses down on the marble at the same time as a 1.5 N-force presses up on the marble.


d. A marble rolling downhill suddenly comes to rest at a garden wall.