The term “differentiated instruction” refers to:

The term "differentiated instruction" refers to adapting lessons to meet diverse learner needs. This foundational educational approach involves proactively modifying curriculum, instruction, and assessment to address the varied learning styles, readiness levels, and interests of students within a single classroom, ensuring all students can access and engage with the content effectively.

• Teaching the same content to all students (A) is the opposite of differentiation.
• Standardizing assessments for all students (C) might be part of a system, but differentiated instruction often involves varied assessment methods.
• Grouping students by ability (D) can be a strategy within differentiated instruction, but it is not the comprehensive definition of the term itself.