Why are so many ethnic cultures found in the United States? People from other countries built many businesses. 
Schools teach students about different cultures.
Communities with many cultures are better run. 
The country has a long history of immigration. 

the correct answer is "tan believes that nonstandard english can make family communication difficult". raising children across cultures can sometimes be challenging, especially when the values and expectations are from different cultures. this can make it difficult to feel a sense of belonging to any community.

c. there are many strengths

the central idea is basically saying that juveniles that have committed a crime will not have the same consequences as the   adults that have. they will have a softer punishment than what the adults have that is harsh in some ways.

i am not sure, but i think the correct answer is a.

hope it : -)