The reason for migration can be categorised as:
AVertical and horizontal factors
Bbackward and forward factors
Cpush and pull factors
Drepulse and attract painting
AVertical and horizontal factors
Bbackward and forward factors
Cpush and pull factors
Drepulse and attract painting
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താഴെ തന്നിരിക്കുന്നവയിൽ ശെരിയായ പ്രസ്താവന ഏത്?