Most active galactic nuclei are at large distances from us; relatively few nearby galaxies harbor active galactic nuclei. what does this imply?

The milky way does not have an active galactic nuclei and active galactic nuclei reduce their activity as time pass.

Explanation:

An active galactic nucleus (AGN) is a region that is compact and at the galaxy's center. It has a extra high luminosity in which some observations indicate that the luminosity is not as a result of the presence of stars.

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.