An indicator of socio-economic development in a country is ______.
A) Occupational structure
B) Literacy
C) Rural-urban composition
D) Sex composition

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Socio-economic development refers to the process of social and economic development in a society. Socio-economic refers to the society related economic factors.

Complete Answer:
Social development is a process which transforms a social institution in such a manner which improves the capacity of a society to fulfill its aspirations. Economic development is a development of the economic wealth of the countries of the region for the well-being of the inhabitants. Socio-economic development leads to the changes in economic and social dimensions. It also incorporates public concerns in development policy for the society and economic initiatives.
Occupational structure: Occupational structure refers to the aggregate distribution of occupations in the society. The distribution of the occupations is done according to the skill levels, economic functions or social status. Occupational structure of the region is shaped by various factors which include the structure of the economic technology, distribution of technological skills, administrative responsibility, labour market and by status as well as prestige. As society changes, the role in shaping the occupational structure changes over time.
Literacy: It is popularly understood as the ability to write, read or use numeracy in at least one method of writing. Literacy is the first step towards freedom from social and economic constraints. It is a requirement for development of both individuals as well as collective. Literacy helps us to reduce poverty, inequality. Literacy also helps us in creating wealth as well as it helps us to eradicate problems of nutrition and public health.
Rural-urban composition: Population is divided into two parts rural and urban on the basis of the size and occupation of the settlements. Rural population consists of small size settlements scattered over the countryside. Urban population is the one that lives in large settlements in towns and cities.
Sex composition: Sex composition is expressed with the help of the ratio known as sex ratio. Sex ratio in India is defined as the number of the females per thousand males in the population. Ratios above thousand indicate excess of females over males and those below 1000 indicate a deficiency of females.
Of the following factors the indicator of socio-economic development is Literacy as it helps in overall development of the society as well as the economic development.

Therefore, the correct option is B.

Additional information:
The current literacy rate in India is 77.7 percent and Kerala is the most literate state in the country. The second most literate state is Delhi while Andhra Pradesh records the lowest literacy rate.

The other factors which determine social and economic development are Gross Domestic Product, life expectancy and levels of employment.