SAT Question 0240d11c: Command Of Evidence answer and explanation

English - Command Of Evidence - Hypothetical Finding Supports
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In the twentieth century, ethnographers made a concerted effort to collect Mexican American folklore, but they did not always agree about that folklore’s origins. Scholars such as Aurelio Espinosa claimed that Mexican American folklore derived largely from the folklore of Spain, which ruled Mexico and what is now the southwestern United States from the sixteenth to early nineteenth centuries. Scholars such as Américo Paredes, by contrast, argued that while some Spanish influence is undeniable, Mexican American folklore is mainly the product of the ongoing interactions of various cultures in Mexico and the United States.
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Difficulty:Hard
Which finding, if true, would most directly support Paredes’s argument?