Answer:
d)Guest workers migrate to the region for jobs in construction and the oil fields, increasing the volume of exports from the region.
Step-by-step explanation:
People migrate for different reasons which range from search for a better living conditions, escape from oppression, etc.
The major effect of migration flow to Southwest Asia from other regions in Asia is guest workers move to Asian countries for jobs in construction and oil fields, thereby increasing volume of exports in the region.