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Option 4 : All (A), (B) and (C)

Migration is the physical movement of people from one place to another; it may be over long distances, such as moving from one country to another, and can occur as individuals, family units, or large groups.

  •  When referring to an international movement, migration is called immigration.

Hint ​Reasons for Migration:

  • Employment opportunities
  • To escape a violent conflict
  • Environmental factors
  • Educational purposes
  • Marriage or to reunite with family.

Hence, given above the statements are correct.

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