Two statements are given, one is labelled as Assertion (A) and the other as Reason (R):
Assertion (A): Majority of people in the west live in towns and cities, where most jobs are to be found and new job opportunities are created.
Reason (R): Urbanisation and industrialisation are closely related.

Both (A) and (R) are true and (R) is the correct explanation for (A)

Both (A) and (R) are true, and (R) is the correct explanation for (A).

Urbanisation and industrialisation are indeed closely related. As industrialisation occurs and industries grow, it attracts people to urban areas, leading to an increase in the urban population. The majority of people living in cities and towns and working in factories is a consequence of the relationship between urbanisation and industrialisation.