Final answer:
The information provided does not directly answer what evidence Elizabeth presented for her product's efficacy. Instead, it covers historical contexts suggesting marketing strategies during the 1930s and Queen Elizabeth I's influence through portraits and support of privateers, none of which pertains to proof of a product's effectiveness.
Step-by-step explanation:
The question about what evidence Elizabeth provided to the world that her product actually worked seems to be referring to an entrepreneurial figure, likely from the historical context or a historical character within a literary or educational framework. However, the provided information does not specify any product that a historical Elizabeth or an educational character named Elizabeth has presented evidence for. Instead, the information provided relates to various historical contexts including Elizabeth I's reign, the expansion of the beauty industry in the 1930s, and literary materials that may be used in college classrooms. It is important to note that without the specific context or identifying the exact 'Elizabeth' and her product in question, it is challenging to provide a clear and accurate answer.
Nevertheless, the text reveals that the promotion of cosmetic products in the 1930s was backed by a 'new science' aimed at examining the effectiveness of marketing strategies rather than the product itself. This might hint at how evidence of a product's success could be provided through well-researched marketing and consumer manipulation techniques rather than solely through traditional scientific validation of the product.
If indeed this question pertains to Queen Elizabeth I and her portrayal, evidence is provided in the form of portraits like the one by George Gower, which symbolically showed her influence over the world. Additionally, Elizabeth I supported English privateers like Francis Drake, whose successful raids on Spanish ships provided tangible evidence of the effectiveness of her maritime policies.