Final answer:
The highly ornamented style known as Ultrabaroque or Churrigueresque in Mexican colonial churches represents a more dramatic and detailed version of the European Baroque, marked by its extreme decoration and the fusion of Spanish and indigenous motifs.
Step-by-step explanation:
The term Ultrabaroque or Churrigueresque refers to the highly ornamented style of colonial churches in Mexico which is characterized by an extreme level of decoration, going beyond the already elaborate Baroque style of Europe. The style is known for its vibrant colored tile, gold leaf against white stucco interiors, and its focus on filling in all the space with decorative elements, such as plasterwork that combines curved, straight, and intermixed lines. Key characteristics include the use of specialized azulejos (tile), unique plasterwork, and local imagery, often incorporating motifs from both Spanish and indigenous cultures.
Churrigueresque was named after the Spanish architect José Benito de Churriguera, who was known for his highly detailed and ornate façades. In Mexico, this style evolved to become even more elaborate, as architects like Lorenzo Rodríguez added complexity and richness to the details, which were reflective of the hybridized ideas and structures of new architecture in the New World. Hence, the correct explanation for the term Ultrabaroque or Churrigueresque is that it signifies a style which includes a high level of ornamentation and is more dramatic than the European Baroque.