Answer:
B. Loyalty to a group with whom one shares a common history, culture, or religion.
Step-by-step explanation:
Nationalism used in historical sense is defined as having a justifiable support for one own's country (either native or host country), not only it's history, it's beliefs and values, but also it's interests on top of others. All countries have members that are nationalistic, who look after their own country more than the world community (which should be so). In essence, take care of your own house and lawn before you judge other countries (or in the analogy, other houses and lawns).
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