Final answer:
Option 2, "The time has come when we got to git in action," is the best example of colloquial diction from Huey P. Long's address, using informal and conversational language.
Step-by-step explanation:
The best example of colloquial diction from Huey P. Long's radio address "Every Man a King" is option 2: "The time has come when we got to git in action." This sentence uses informal language that might be spoken or heard in everyday conversation, reflecting Long's style of connecting with the common people. His use of colloquial language was a strategic choice to make him appear as a man of the people, distancing himself from the typical polished politician and resonating with the audience on a personal level.