Julio had a strong sense of ethnic identity. our ethnic identity is by our group having smaller numbers in a society and being the object of discrimination.

The answer that best completes the statement above is HEIGHTENED. Our ethic identity is heightened by our group having smaller numbers. Knowing that Julio possesses this strong sense of ethnic identity, he also strongly believe that he belongs to a particular ethnic group and practices what the ethnic group does. We know ethnic groups only comprise of a small number of population making them prone to discrimination for being different.

Yes all of them are right