An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity B, the magnetic field $$B_s$$ inside the superconductor will be such that:

A

$$B_s = B$$

B

$$B_s = 0$$

C

$$B_s < B$$ but $$B_s \neq 0$$

D

$$B_s = -B$$