Which sentence correctly uses a colon to introduce a quote? Select one:

Veterinarian Cindy Frost, a dog-lover: People with dogs “are simply happier.”

Veterinarian Cindy Frost is a dog-lover, who reminds us that: people with dogs are simply happier.

Veterinarian Cindy Frost discusses being a dog-lover: “People with dogs are simply happier.”

Veterinarian Cindy Frost discusses: being a dog-lover, “People with dogs are simply happier.”