Which among the following are the central questions of Ionian philosophers?
1. Where did every things come from?
2. Why we see so much variety among things?
3. Why human exist?
4. What nature to be without from?
5. How can nature be described mathematically?

A. 1 and 2

B. 1, 2, 3 and 5

C. 1, 2 and 5

D. 2, 3 and 5

Answer: Option C