What is the central idea of Descartes' statement 'I think, therefore I am'?

Answer and explanation

Correct answer: D. The act of doubting shows that a thinking self must exist

  1. Step 1: Descartes doubted everything he could.
  2. Step 2: Even doubt is a form of thinking, which proves the existence of the one who thinks.
Answer
The act of doubting shows that a thinking self must exist.
Why not the others: The other statements describe empiricism and Kant's ethics, not Descartes' starting point.

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