Final answer:
Jupiter's strong magnetic field is produced in the metallic hydrogen layer, where high pressure creates a state where hydrogen acts like a metal, therefore the correct answer is b) metallic hydrogen layer.
Step-by-step explanation:
Jupiter's strong magnetic field is generated in its metallic hydrogen layer. Under the intense pressures inside Jupiter, hydrogen, which is normally a gas, is compressed to the point where it becomes metallic. This means the electrons are not tightly bound to their parent nuclei, allowing for free movement similar to the behavior in traditional metals. It's this movement of electrically charged particles (electrons) in the liquid metallic hydrogen that generates Jupiter's powerful magnetic field, similar to the process that generates Earth's magnetic field in its liquid metallic core.