The research that applies the laws at the time of field study to draw clearer ideas about the problem is

Applied research applies established laws during field study to gain clearer ideas about a problem.

Action research aims to solve an immediate local problem rather than to apply general laws for clarity.

Experimental research tests cause and effect under controlled manipulation, not field application of laws.

The none choice is wrong because applied research precisely names this problem-clarifying application.

Applied research uses existing theory and knowledge to address practical concerns.

Its findings are meant for direct use rather than for the advance of pure theory.