A snag or other underwater obstruction may form a __________.

Correct Answer: Option B — V-shaped ripple with the point of the V pointing upstream

Water flowing over a submerged obstruction creates a disturbance on the surface. As the water passes the object, it forms a V-shaped ripple pattern. Because the obstruction is fixed, the point of the V faces upstream, indicating the presence of the hazard to the observant mariner.