The core concept here is 'liberal', which in this context means broad-minded and open to diverse viewpoints and subjects. A liberal approach to education therefore promotes a wide range of knowledge. **Core Concept:** The meaning of 'liberal' in the context of education. **Correct Answer Analysis:** Option C directly reflects the concept of 'liberal' by emphasizing a wide-ranging understanding. **Incorrect Answer Analysis:** - Option A is the opposite of liberal, promoting rigidity rather than openness. - Option B is narrow and vocational, missing the broad perspective of a liberal approach. - Option D is restrictive, not in line with the spirit of a liberal education. **Key takeaway:** A 'liberal' approach means open-minded and not restrictive.