The research described is focused on studying the effect of reinforcement on student achievement in a practical situation. This indicates that the research aims to solve a specific, real-world probl

• Basic research (also known as fundamental research) is conducted to expand general knowledge and understanding of fundamental principles, without an immediate practical application in mind.
• Applied research is designed to solve practical problems of the modern world, rather than to acquire knowledge for knowledge's sake. It uses existing knowledge to address specific issues.
• Fundamental research is synonymous with basic research.
• Action research is a specific type of applied research conducted by practitioners in their own setting to improve their practice. While this study is in a practical situation, "Applied" is the broader category for research aimed at practical solutions.

Since the research is conducted in a "practical situation" to understand the "effect of reinforcement on student achievement," its goal is to apply findings to improve a real-world educational outcome. Therefore, it is a type of applied research.

The correct option is:

• Applied