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When boating on a river, you might encounter these strainers and the danger of these strainers is that they can possibly trap your boats and throw the passengers out of the boat. Strainer is the term that describes anything that obstructs the way in the river such as logs, or wire fence. 
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Answer:

The correct answer is that the danger caused by a strainer could make the person above the boat falls down into the river or even worse like get trapped into the strainer.

Explanation:

A strainer is a natural obstruction in a river that could also be created by the man kind for a purpose like avoinding the water to flow in a certain direction. It represents the obstacle that makes more difficult to navigate for the person in the boat, examples of it could be such as trees or root systems.