Final answer:
The author's thesis is stated in option 3: "The idea behind creating Rosie the Riveter was to encourage women to work in factory jobs while men fought in World War II."
Step-by-step explanation:
The sentence that states the author's thesis is:
Option 3: "The idea behind creating Rosie the Riveter was to encourage women to work in factory jobs while men fought in World War II."
This sentence clearly states the main idea of the passage, which is that Rosie the Riveter was created to promote women's participation in the workforce during World War II. It serves as the thesis statement, guiding the overall argument of the passage.
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