A piece of copy paper has a thickness of approximately 4x10^-3 inches, and a human hair has a thickness of approximately 1x10^-3 inches which of the following is true
A: A piece of copy paper is approximately four times thicker than the human hair
B: a human hair is approximately 40 times thicker than a piece of copy paper
C: a human hair is approximately four times thicker than a piece of copy paper
D: A piece of paper is approximately 40 times thicker than a human hair