Solution:Rene Descartes is not an Empiricist philosopher, and rest of all are Empiricist philosopher : John Locke, David Hume, George Berkeley, Immanuel Kant, Francis Bacon, William James, Seatus Empiricus, John Dewey.
In philosophy, empiricism is an epistemological view which holds that true knowledge or justification comes only or primarily from sensory experience and empirical evidence. Hence, option (a) is correct.