According to the following philosophers, (Plato, Descartes, Locke, Berkeley, Hume, Kant), how do we know things?

According to the following philosophers, (Plato, Descartes, Locke, Berkeley, Hume, Kant), how do we know things? Choose two of the preceding philosophers and compare their answers to this question. Evaluate their claims, and explain who makes a better argument for their position.