Answer:
b. Grounded theory
Explanation:
Grounded Theory is an approach used when you want to do research, but there is no theory to prove it, but there is a desire to understand a situation and there is a desire to understand how members in that situation act in a certain way. In this type of approach the data collection is made, with a volume of information necessary to make it possible to reach conclusions about the research. The data collected serve to guide the experiment but not to extrute.