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The expression `South Asia` refers to a geographical region that includes several countries. In this question, the correct answer is option 1 - Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, and Sri Lanka.
Option 2 includes countries like Afghanistan and China, which are not usually considered part of South Asia. Therefore, option 2 is incorrect.
Option 3 includes countries like China, Japan, and Maldives, which are not typically included in the South Asia region. So, option 3 is also incorrect.
Option 4 includes countries like China, which is not commonly considered part of South Asia. So, option 4 is also incorrect.
Overall, option 1 is the correct choice as it includes the countries that are traditionally recognized as part of South Asia.