I think its A.
Sorry if it isn't.
Answer:
Migrate from one region to another
Explanation:
Famine -food scarcity-, warfare -war situations-, and religious persecution have most often influenced people’s decisions to <u>migrate from one region to another.</u>
For centuries, <em>people have migrated from one region to another to escape from tough situations like food scarcity, war, racism, lack of opportunities, religious persecution</em>, amongst many others.
Migration can permit an individual or group of individuals (family) to have access to better opportunities and live a better-quality life.
They show the most important substances as it can show how they reac in a chemical and how they are able to react