Final answer:
The narrator notices that the language spoken is different at Dora's house. Caitlin faced challenges with language and cultural norms during her stay, revealing how cultural socialization affects our interactions.
Step-by-step explanation:
The significant thing that the narrator notices as different from her own house when she is at Dora's house is d) The language they speak. Caitlin was overwhelmed by the new customs, language, and surroundings in Maria's house. Although she studied Spanish for years, it did not prepare her for the real-world application of the language and the cultural nuances that come with it, such as interpreting facial expressions or understanding when to make a toast.
These experiences highlight how cultural norms define our interactions and interpretations of social situations. Socialization by religion is another aspect where cultural norms play a significant role, as addressed in a question where option c) 'An individual's personal internal experience of a divine being leads to their faith' is not a way people are socialized by religion; rather, socialization typically involves shared experiences and practices.