If the graph of an object's position over time is a horizontal line and \( y \) is not equal to 0, this indicates that the object's position is constant over time. Therefore, we can conclude the following:
- Position is constant: The object is not changing its position as time progresses.
- Velocity: The slope of the position vs. time graph represents the velocity. Since the line is horizontal, the slope is zero, which means the velocity is 0.
- Acceleration: Since the velocity is constant (in this case, zero), there is no change in velocity, meaning the acceleration must also be zero.
Based on this analysis, the correct answer is:
A) The velocity is zero.