Many Native American students are soft-spoken and hesitate to participate in classroom discussions. Amy, however, is a Native American who actively participates in class and often asks questions. Amy's behavior illustrates that .

Culture Heterogeneous

Explanation:

Cultural heterogeneity corresponds to cultural identity disparities linked to, say, gender, race, language, customs, faith, sense of space and many other cultural issues. These differences can make communication, trusting and cooperating with each other,  complicated for people. As per the question Amy's contradictory behavior to her cultures is an example of cultural heterogeneity.

answer; i do believe its (b) 12.5 years of age;