Aresearcher studies the effect of asthma action plans on frequency of emergency department visits for asthma-related symptoms. the study would be described as:

Applied research

Explanation:

Applied research, a research methodology which is generally used to solve specific, practical, real life and everyday problems.  

Applied research plays an important role in solving the everyday problems which have impact on overall well-being.  

It is used to find the solutions to the everyday problems, to cure illness, and to develop innovative technologies.

The example of the researcher address real-world issues. This practical application of findings is what distinguished the methodology of applied research from the methodology of basic research, which basically focuses on theoretical concerns.

i think the answer is c

hope this