Respuesta :
The main idea of the passage is An arm appears out of the water and shakes the sword three times. This shows that the there are many traitors in his men and that no one can ever helped him when he was drowning in the water that is why he was asking for help.
There could be multiple correct answers to this excerpt from Thomas Malory's work on King Arthur. However, we have got a multiple choice question and we have to obtain the correct answer from these options. It is a supernatural event that has been described in this excerpt. And we don't observe first, second or fourth options in the excerpt. There are lines "...there came an arm and a hand above the water and took it and clutched it, and shook it thrice..." which is the paraphrase for the answer in the second option - An arm appears out of the water and shakes the sword three times. Therefore, the correct answer is the second one.