What is not an advantage of Discovery method?

The Discovery Method is a learner-centred teaching approach in which students construct their own understanding by exploring problems, forming hypotheses, experimenting and drawing conclusions on their own, with the teacher acting mainly as a facilitator rather than a direct instructor. Because it depends on the learner already having some prior knowledge and the maturity for independent, abstract reasoning, its real benefits and its real limits both follow directly from how much of that independent thinking the learner can already do.

Applying this to the given statements: the outcomes described as scientific and critical attitude, life-skills training, and self-confidence and self-reliance are the well-recognised benefits that follow naturally from having students investigate and solve problems on their own. Claiming the method suits students of lower classes, however, goes against this: discovery learning assumes prior knowledge, abstract reasoning and sustained independent effort that younger or lower-class learners typically have not yet developed, so without heavy teacher scaffolding the method is difficult for them to use effectively. That is the one statement that is not a genuine advantage of the Discovery Method.

• "It develops scientific and critical attitude among students" holds true: investigating problems, testing ideas and weighing evidence for themselves is exactly what builds a scientific, critical outlook, so this is a genuine advantage.

• "It provides training to prepare students for life" holds true: solving real problems independently builds practical, transferable skills useful beyond the classroom, so this is a genuine advantage.

• "It develops self-confidence and self-reliance" holds true: succeeding at independent exploration and decision-making builds confidence and self-reliance, so this is a genuine advantage.

• "This method is suitable for the students of lower classes" does not hold: lower-class learners generally lack the prior knowledge and abstract-reasoning maturity the method assumes, so this is the exception, and it is the correct answer.

So the statement that is NOT an advantage of the Discovery Method is that it is suitable for students of lower classes.