What does the word its in paragraph 2 refer to?

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The 21st century has witnessed the surprisingly increasing formation of multicultural societies where a varying number of ethnic people stay together.

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Integration and assimilation can help reduce feelings of loss and grief as the migrant starts to incorporate aspects of the majority culture.

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What exactly are white collar workers? They are people who work in offices and administrative positions.

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I am not able to go anywhere this weekend because I am up to my________ in work.

Thanks to his support, I was able to finish the project.

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Helen Keller, (A)who was both blind and (B)deafness, (C)overcame her (D)inabilities with the help of her teacher, Ann Sullivan.

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The Internet is a treasure trove of information, which offers knowledge on any given topic under the sun.

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Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes the following exchange.

John: "Do you think that people should protect their cultural identities in the age of globalization?”  Jane: “____”

It is not always easy to________ the difference between fact and opinion.

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Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in the following question.

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