PLZ HELP ASAP Read this excerpt from a blog.

If you have a beloved pet relaxing on your porch, guarding your front door, or chasing its tail in the yard, then you have an obligation. Every dog needs yearly vet visits to maintain proper health. Although some vaccines vary by exposure, every dog must maintain a few core vaccines, including vaccines for rabies and distemper. Distemper is the leading cause of death from infectious disease for dogs, and it can be easily avoided. Veterinarians recommend yearly checkups for adult dogs for vaccines, heartworm medicine, and a preventative care regimen.

How does the writer of this blog promote change?

by sharing personal stories
by explaining researched facts
by encouraging reader discussion
by criticizing existing policies