Why is hubble's law better than using trigonometric parallax?

Hubble’s law is better than trigonometric parallax because Hubble’s law show that galaxies have redshifts that are bigger where in the velocity of the galaxy is equal to the distance. Also the Hubble’s law is used to show that the universe is expanding.

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.