Final answer:
The most clear thesis statement in the introduction paragraph is Sentence 4, which outlines the main argument that the essay will detail regarding the dangers of being stubborn in 'Antigone'.
Step-by-step explanation:
The sentence in the introduction paragraph that most clearly represents the thesis statement is Sentence 4: "By showing the audience what happens to each character, Sophocles shows the dangers of being stubborn." This sentence articulates the main argument that the essay will support, indicating that Sophocles's tragedy Antigone demonstrates the perils of inflexibility. It does this by briefly summarizing the point that the paper will elaborate on through the analysis of the characters' fates. Therefore, the correct answer is OB. Sentence 4.