Based on "The Bell Rock," the permanent structure that was added to the Bell Rock in the early 1800s after a highly destructive storm was:
According to the complete question, we can see that there was a strong storm that occured in the 1800s that affected The Bell Rock and caused a huge damage and loss.
As a result of this, there was an addition of a lookout to help to make sure that such tragedy does not have such disastrous effect on the people next time.
Therefore, the correct answer is option D
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