The main issue that the researcher addresses in the investigation is called the:

A) Critique.
B) Hypotheses.
C) Research design.
D) Research problem.

Research Problem

The specific issue, contradiction, or gap in knowledge that a researcher aims to address, explore, or solve through their study.

Research Design

The structured plan or strategy developed to explore a specific problem or question, guiding the collection and analysis of data.

Hypotheses

Tentative explanations or propositions made on the basis of limited evidence as a starting point for further investigation.