The research that applies the laws at the time of field study to draw more and more clear ideas about the problem is :

The correct answer is: A. Applied research

Applied research is a type of research that is conducted to solve a specific problem or issue. It is often used in the fields of business, government, and education. Applied research is typically conducted by teams of researchers who work together to develop and implement solutions to problems.

Applied research can be contrasted with basic research, which is conducted to advance knowledge in a particular field. Basic research is often conducted by individual researchers who work independently.

Here is a brief explanation of each option:

• Applied research is a type of research that is conducted to solve a specific problem or issue. It is often used in the fields of business, government, and education. Applied research is typically conducted by teams of researchers who work together to develop and implement solutions to problems.
• Action research is a type of research that is conducted by practitioners in order to improve their practice. It is often used in the fields of education, social work, and healthcare. Action research is typically conducted by small groups of practitioners who work together to identify and solve problems in their practice.
• Experimental research is a type of research that is conducted to test a hypothesis. It is often used in the fields of science, medicine, and psychology. Experimental research is typically conducted by teams of researchers who work together to design and conduct experiments.
• None of these is the correct answer.