Final answer:
Roseto is located in Pennsylvania, where the Healthy Immigrant Effect was observed, showing lower rates of heart disease among the Italian-American community compared to the national average. The correct option is b.
Step-by-step explanation:
Roseto, where the Healthy Immigrant Effect was observed, is located in Pennsylvania. The Healthy Immigrant Effect refers to the phenomenon where newly arrived immigrants have better health outcomes than their native-born counterparts and those immigrants who have lived in the host country for a longer period.
This effect was notably observed in Roseto, Pennsylvania, where a community of Italian-Americans displayed remarkably low rates of heart disease in the mid-20th century compared to the national average, due in part to their close-knit community and social structure. The correct option is b.