Step 1: Read the question.
We must identify the major objective of education.
Step 2: Recall the root idea.
Education means drawing out the learner's inner potential, not just controlling them.
Step 3: Test option A.
Reforming society is a wider social outcome, not the primary aim, so it is secondary.
Step 4: Test option B.
Making students disciplined is a method, not the central objective.
Step 5: Test option D.
Making students follow teachers promotes dependency, against modern education.
Step 6: Confirm option C.
Developing the inherent abilities and powers of students reflects the true child-centred aim.
Step 7: Conclude.
Hence education chiefly develops inner abilities.
\[ \boxed{\text{C. Developing inherent abilities/powers of students.}} \]