[Ans] According to the National Retail Foundation, which Halloween costume was the most popular among U.S. adults in 2012?



​ Step 1 : Introduction to the question "According to the National Retail Foundation, which Halloween costume was the most popular among U.S. adults in 2012?" The National Retail Federation (NRF) is the world's largest retail trade association. Its members include department stores, specialty, discount, catalog, Internet, and independent retailers, chain restaurants, and grocery stores. Members