The branch of philosophy that has to do with questions relating to existence and reality is metaphysics.
The first step in the Rene Descartes method is option C "not accepting everything to be true unless such thing is really true".
Some of the rules in the Rene Descartes method include:
• accept nothing as true which isn't self-evident
• problems should be divided into their simplest parts
• to solve problems, one should proceed from the simplest and gradually to the complex ones.
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