What is the best way to: How to draw a perfect circle without a compass?

OPT:
I. Hold your thumb against the paper. At the same time hold the pencil such that the size of the circle depends on the position where you hold the pencil. Hold the paper still and just rotate the pencil to draw a perfect circle..
II. Hold your thumb against the paper. At the same time hold the pencil such that the size of the circle depends on the position where you hold the pencil. Hold the pencil still and just rotate the paper to draw a perfect circle..
Answer:
II.