Answer:

B. Rene Descartes

Why?

In the first half of the 17th century, the French Rationalist René Descartes used methodic doubt to reach certain knowledge of self-existence in the act of thinking, expressed in the indubitable proposition cogito, ergo sum (“I think, therefore I am”).

Explanation:

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Answer:

b. Rene Descartes

Explanation:

Descartes's Meditations on First Philosophy (1641) continues to be a standard text at most university philosophy departments. Descartes's influence in mathematics is equally apparent; the Cartesian coordinate system was named after him.