Peter should develop his thesis statement during the prewriting stage. At this stage, an author thinks about what he is going to write about further down in the text, and a thesis statement is exactly that - a short summary of the main ideas that are going to be developed in a text.
4) D
The sentence is generally saying that the specific area of land gives you shelter from a storm, which is basically safety. The word 'encloses' itself emanates safety, because basically, 'encloses' means to close over, or to surround. If you don't find that trapping, it would seem more safe than anything else, along with what the sentence itself is trying to say.
As for #5, I can't seem to view the full choices for the question. Could you maybe add another attachment, or list the other two choices there are?
The answer is b..........
