What is the best way to punctuate the bolded portion of the sentence?

The New York Times called Vonnegut a “laughing prophet of doom

“laughing prophet of doom

“laughing prophet of doom.

“laughing prophet of doom.”

“laughing prophet of doom”

“laughing prophet of doom”

The best way to punctuate the bolded portion of the sentence is:

"laughing prophet of doom."