People in opposition to multiculturalism believe it:
1.causes a splintering of society
2.protects the immigrant's heritage
3.brings about a loss of national identity
4.causes too much diversity in society

3.birngs  about a loss of national identity

Explanation:

People in multiculturalism believe that it brings about a loss of national identity as the presence of multi culture may show variety in masses that is people have different believes and culture which may seclude them to their culture.People may reluctant to accept the other culture and find difficult to mix with others.

Unity is the key to establish multiculturalism in a particular nation.

the best answer is b.

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