Final answer:
Santa Cruz Island, known for its steep cliffs and varied coastline, likely requires the least dredging compared to harbors at Hueneme and others, as these features minimize sediment accumulation.
Step-by-step explanation:
When considering which harbor requires the least dredging, it's important to consider the geographical features and natural sediment movement of the area. Santa Cruz Island, with its steep cliffs, coves, and gigantic caves, is less likely to accumulate large amounts of sediment that require frequent dredging. On the other hand, a harbor like Hueneme might experience more sediment deposition due to its location and would thus require more regular dredging to maintain depth and navigability.