At the end of paragraph 1, when the author says “First, we must develop many different ways of putting the waste from these nuclear and chemical substances in, on, and around the earth” it helps shape the reader's perception of the text as by starting to go into more details and more ideas on poisoning the Earth.
C is the main theme of this story, for the reason of it providing multiple clues of text evidence throughout the passage that leads back to option C. Therefore, option C should be your answer.
While Odysseus battles and his journey are successful due to his intellect, Penelope similarly uses her intelligence to avoid being remarried, even if she does so in a less conspicuous way. Penelope never remarries, and always waits for him.