Concept:Remedial teaching is based on identifying a student’s learning difficulties first. This identification is done through diagnostic assessment.Explanation:Diagnostic testing finds the specific problems a student faces. After diagnosis, remedial teaching is given to correct those problems. Without diagnosis, remediation cannot be planned. Diagnostic and remedial teaching are two sides of the same coin. Thus, the foundation of remedial teaching is diagnostic testing.Answer:B. निदानात्मक परीक्षण