Latin American cultures have blended together over time.
Option: C
Explanation:
From the passage, we get to know that the 'Dia de Los Muertos' or 'Day of the Dead' is celebrated by the Mexicans, Mexican Americans and many who live in the 'Southwestern' United States. It means that over time the religious and traditional cultures have got mixed and have created a big influence on every Mexican, Mexican Americans and the Southwestern residents of US. It has been now become a part of Latin America’s culture.