The correct answer is: C. use of behaviour science in the study of all aspects of organisation behaviour.

Behavioural approach in the study of organisation is the study of human behaviour in the workplace. It is a multidisciplinary approach that draws on psychology, sociology, and other social sciences. The goal of behavioural approach is to understand and improve the effectiveness of organisations by understanding the behaviour of individuals and groups within them.

Behavioural approach has been used to study a wide range of organisational issues, including motivation, leadership, decision-making, and conflict resolution. It has also been used to develop training programs and interventions to improve organisational performance.

Some of the key concepts in behavioural approach include:

  • Motivation: The reasons why people behave the way they do.
  • Leadership: The ability to influence others to achieve a common goal.
  • Decision-making: The process of choosing between alternative courses of action.
  • Conflict resolution: The process of resolving disagreements between individuals or groups.

Behavioural approach is a valuable tool for understanding and improving organisational effectiveness. It can be used to identify and address problems, develop solutions, and improve the performance of individuals and groups.

Here is a brief explanation of each option:

  • Option A: This option is incorrect because it does not focus on the behaviour of individuals.
  • Option B: This option is incorrect because it only focuses on the behaviour of individual public servants.
  • Option C: This option is correct because it focuses on the use of behaviour science in the study of all aspects of organisation behaviour.
  • Option D: This option is incorrect because it only focuses on the study of the organisational structure on the basis of behaviour of the groups.