Effectiveness of teaching depends primarily on:

Concept

Teaching is effective when instruction produces the intended learning and understanding in students.

Teacher-related attributes contribute to effectiveness only insofar as they help the teacher present ideas clearly, adapt them to learners, and check comprehension.

Application

Among the given choices, the ability to explain a concept directly turns subject knowledge into learner understanding. It includes sequencing ideas, choosing suitable examples, responding to difficulties, and checking whether learners have understood.

Contrast

• Formal qualification shows academic preparation and eligibility, but it does not by itself establish classroom clarity.

• Handwriting affects the legibility of written material, but it represents only one presentation aid.

• Personality can influence rapport and classroom climate, but it is not the specific instructional process that develops conceptual understanding.

Cross-check

A teacher may be qualified, personable, and have neat handwriting, yet learning remains weak if explanations are unclear. Clear explanation supported by examples and comprehension checks connects teaching activity with learning outcomes.

Therefore, teaching effectiveness depends most directly on the teacher's ability to explain concepts to learners.