A good teacher is one who :

Concept

A teacher's work is judged by what it produces in the learner, not by the quantity of material handed over. Information, exposition and study material are inputs; the learner's own willingness to go on studying is the outcome that decides whether those inputs do any work at all.

Motivation belongs to the affective domain (Krathwohl), and pedagogy treats it as the condition on which every cognitive input depends: an unwilling learner takes little from even the clearest exposition, while a motivated learner will go and find information, explanation and notes without being asked.

Application

The stem asks for the mark that distinguishes a good teacher, so the offered acts must be ranked by how much learner agency each one creates. Supplying facts, clarifying ideas and handing over prepared notes all keep the teacher as the source of the learning; arousing the student's own motive to study transfers the initiative to the learner and keeps it working after the class ends. The best-supported answer is therefore “inspires students to learn”.

Cross-check

• “gives useful information” — information is necessary, but it is equally available from a textbook or a search engine, so it does not by itself separate a good teacher from a mediocre one.

• “explains concepts and principles” — the strongest of the alternatives and a real teaching skill, yet explanation still leaves the learner waiting on the teacher for every new idea.

• “gives printed notes to students” — an administrative convenience; ready-made notes replace the learner's own note-making and can reduce, rather than raise, engagement.

• “inspires students to learn” — it sets the learner's own motive in motion, and a motivated learner then acquires the information, the explanations and the notes independently.

This is why the official key for this paper marks “inspires students to learn” as the answer.