Which statement correctly compares nuclear fission with nuclear fusion? A. Nuclear fission produces energy from matter, and nuclear fusion produces matter from energy.
B. Nuclear fission uses hydrogen, and nuclear fusion uses uranium.
C. Nuclear fission does not produce radioactive waste, and nuclear fusion does.
D. Nuclear fission splits nuclei, and nuclear fusion joins them.

B

Explanation:

B. Nuclear fission uses hydrogen, and nuclear fusion uses uranium

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.