Migration

The correct option is (B) :Time bound contract for migration

The correct option is (C):transhumance.

Step 1: Understanding the Concept:
Migration is influenced by push and pull factors. Push factors are negative conditions that compel people to leave their location of origin (e.g., war, poverty, natural disasters). Pull factors are positive attributes of a destination that attract people to move there (e.g., job opportunities, safety, better quality of life).
Step 2: Detailed Explanation:
Let's analyze the options:
1. Unemployment: This is a negative economic condition that forces people to leave a place in search of work. It is a classic push factor.
2. Poor living conditions: This refers to inadequate housing, sanitation, and services, which makes a place undesirable and drives people away. It is a push factor.
3. Political turmoil: This includes war, instability, and persecution, which threaten people's safety and security, forcing them to flee. It is a strong push factor.
4. Pleasant climate: A favorable climate is an environmental amenity that makes a destination more attractive, enhancing the quality of life. It is a pull factor, often attracting retirees or those seeking a better lifestyle.
Step 3: Final Answer:
Among the given options, only a pleasant climate acts as a pull factor, attracting migrants to a new location.