Read the following factors of migration carefully and choose the correct option related to pull factors: 
I. Peace and stability 
II. Unfavourable climate 
III. Protection of property 
IV. Economic backwardness 
 
Only II and III are correct.
Pull factors in migration refer to positive conditions that attract individuals to a particular location. 
Peace and stability (I) and Protection of property (III) are examples of pull factors, while Unfavourable climate (II) and Economic backwardness (IV) are push factors.
Match List-I with List-II
| List-I | List-II | 
|---|---|
| (A) United Nations Security Council | (II) New York | 
| (B) International Court of Justice | (III) Hague | 
| (C) International Labour Organisation | (I) Geneva | 
| (D) United Nations Educational Scientific and Cultural Organisation | (IV) Paris | 
In the given reaction sequence, the structure of Y would be: