B

Step 1: Understand that a hysteresis loop represents the relationship between magnetic induction (B) and magnetic field strength (H) in a magnetic material.
Step 2: For permanent magnets, the hysteresis loop is typically tall and narrow, indicating that the material has a high coercivity and remanence. This implies that the magnet can retain its magnetization effectively after the external magnetic field is removed.
Step 3: A tall and narrow loop also means that a considerable field strength is required to demagnetize the material, which is characteristic of permanent magnets.
Therefore, the hysteresis loop for the material of a permanent magnet is best described by option B: tall and narrow.