Action research that is usually meant for professional people is:

A longitudinal research
An applied research
A research initiated to solve an immediate problem
A research with socioeconomic objective

The correct answer is C. A research initiated to solve an immediate problem.

Action research is a type of research that is conducted by professionals in order to solve an immediate problem. It is a cyclical process that involves planning, acting, observing, and reflecting. The goal of action research is to improve the practice of the professional and to make a positive impact on the people they serve.

Longitudinal research is a type of research that involves collecting data over a long period of time. This type of research is often used to study changes in behavior or attitudes over time.

Applied research is a type of research that is conducted to solve a practical problem. This type of research is often used to develop new products or services, or to improve existing ones.

Research with socioeconomic objective is a type of research that is conducted to study the social and economic conditions of a population. This type of research is often used to develop policies or programs that will improve the lives of people in the population.

In conclusion, action research is a type of research that is conducted by professionals in order to solve an immediate problem. It is a cyclical process that involves planning, acting, observing, and reflecting. The goal of action research is to improve the practice of the professional and to make a positive impact on the people they serve.