Final answer:
Marta's acculturation is characterized by separation, and she is likely to experience high levels of acculturative stress due to her isolation from American society.
Step-by-step explanation:
Marta's pattern of acculturation would be classified as separation, as she continues to speak only her native Portuguese and interacts solely with others who have immigrated from Brazil, consequently isolating herself from American society.
Separation refers to when an individual maintains their own cultural identity and does not interact with or adopt the new culture they are living in. Marta's only speaking Portuguese and interacting only with others from Brazil indicates that she is isolated from American society, leading to high acculturative stress.
Her acculturative stress level would likely be classified as high because this self-imposed separation could lead to significant stress due to isolation and potential difficulties in navigating the host society without adopting any of its cultural norms or language.