Sentence 4 is the most likely restatement of the thesis, summarizing the central argument that language is a powerful tool.
The restatement of the thesis in a conclusion paragraph is typically done in a way that encapsulates the main argument of the essay using new words. Looking at the given sentences from the conclusion paragraph, sentence 4 most likely represents this restatement, as it summarizes the central argument of the essay: that language is a powerful tool. This sentence contextualizes the evidence presented throughout the essay, showing how it supports the thesis statement. Sentence 1, in this context, should serve as the restatement of the thesis, but it is more of a general statement about the theme of the speeches rather than a restatement of the exact thesis. Sentences 2 and 3 provide summaries of the arguments but do not encapsulate the overall thesis statement as effectively as sentence 4 does.