The distribution of working persons across different industries and sectors is called :

Occupational structure

The correct answer is option (3) : Occupational structure

1. Structural Composition :- This term generally refers to the overall makeup or arrangement of something. In the context of economics or sociology, it might be used to describe the composition of a population or a workforce in terms of various factors like age, gender, education, etc. It's a broad term and might not specifically refer to the distribution of workers across industries.

2. Sectoral Change : Sectoral change typically relates to shifts or changes in the economic structure of a country or region. This can include changes in the relative importance of different sectors like agriculture, manufacturing, and services. It focuses on transitions between sectors rather than the specific distribution of workers within those sectors.

4. Structural Change : Structural change refers to significant changes in the fundamental features or components of a system or organization. In the context of economics, it often implies changes in the economic structure, such as shifts from agriculture to industry and then to services. This can involve changes in technology, institutions, and the composition of output and employment.