What happens to the employment structure in case of an industrialized society?

The majority of the population shifts their job from agriculture to factories.

The correct answer is Option 1: The majority of the population shifts their job from agriculture to factories.

The majority of the population shifts their job from agriculture to factories — Correct. Industrialisation creates new employment opportunities in factories, offices and shops. As industries expand, a larger share of the workforce moves away from agriculture and takes up non-agricultural occupations.

The majority of the population shifts their job from agriculture to service sector — Incorrect. Majority of population shifts to industrial sector and not service sector. 

The unemployment levels gradually increase with industrialization — Incorrect. Industrialisation changes the occupational structure by creating new kinds of jobs. No conclusion can be drawn that it necessarily leads to a gradual increase in unemployment.

NCERT: Industrialisation refers to the emergence of machine production, based on the use of inanimate power resources like steam or electricity. In most standard western textbook of sociology, we learn that in even the most advanced of traditional civilizations, most people were engaged in working on the land. The relatively low level of technological development did not permit more than a small minority to be freed from the chores of agricultural production. By contrast, a prime feature of industrial societies today is that a large majority of the employed population work in factories, offices or shops rather than agriculture. Over 90 per cent of people in the west live in towns and cities, where most jobs are to be found and new job opportunities are created. Not surprisingly, therefore, we usually associate urbanisation with industrialisation. They often do occur together but not always so.