A sea anchor helps prevent which of the following?

A sea anchor is an important tool used on boats, particularly in rough weather conditions. Its primary purpose is to help stabilize the vessel and prevent it from swinging around in the waves. This stabilization is particularly effective in preventing broaching, which is when a boat turns broadside to the waves and can be at risk of tipping over or capsizing as a result.

When the sea anchor is deployed, it creates drag in the water. This drag helps the boat maintain a more controlled orientation to the waves, reducing the chance of being pushed sideways by the swell. By keeping the bow pointed into the waves, the sea anchor helps maintain a more stable position, thereby decreasing the risk of broaching.

In terms of the other options, while a sea anchor can contribute to overall safety and stability, it doesn't specifically prevent capsizing, bearing drift, or sinking in the same direct way that it helps prevent broaching. Capsizing involves a more extreme loss of balance that might occur under several conditions beyond the control of a sea anchor, such as extreme weather or improper load distribution. Bearing drift refers to the change in direction of a vessel due to wind or current, which is not directly addressed by a sea anchor, and sinking is a more severe situation that would require