During a DWI stop, which of the following observations could be a sign of poor coordination?

Frequent stumbling is indicative of poor coordination because it suggests that the individual's balance and motor control are compromised. Coordination involves the ability to move body parts smoothly and efficiently, and stumbling typically occurs when a person is unable to maintain their balance or when their movements are affected by factors such as intoxication or fatigue. Observing someone who stumbles frequently can signal an impairment that may be relevant in a DWI context, as it points towards difficulties in maintaining control over physical movements.

In contrast, stable walking and walking in a straight line demonstrate good coordination, as these actions require balance and controlled movements. Quick movements, while they may not directly indicate good or poor coordination, do not necessarily imply a lack of it. Therefore, frequent stumbling stands out as a clear indicator of coordination issues.