Answer:
The correct answer is letter "C": in-depth interviews.
Explanation:
In-depth interviews are approaches to obtain valuable information. They can take the form of surveys where data about a specific topic is collected to later be analyzed and take decisions over a certain matter. If necessary, additional information could be requested to complete the research matching the expectations of the study.
The main objective of in-depth interviews is to capture individuals' thoughts, ideas, and behaviors.