The bars in barred spiral galaxies are formed through ; ( D ) slow evolution
Barred spiral galaxies are galaxies which appear with its center having a bar-shaped structure which is populated with stars, and this is found/commonly seen in about 50% of spiral galaxies.
The bar shaped center helps with the regulation of the movement of stars, dust and gas in the spiral galaxies.The bars are formed as the spiral galaxies continue to evolve slowly overtime.
Hence we can conclude that The bars in barred spiral galaxies are formed through slow evolution.
Learn more : https://brainly.com/question/16337002
