Final answer:
Approximately 250,000 Okies actually came from Oklahoma, based on the historical context of the Dust Bowl during the 1930s, which displaced around 800,000 people.
Step-by-step explanation:
The question asks about the number of 'Okies,' a term used to describe those who migrated from Oklahoma during the Dust Bowl of the 1930s, who actually came from Oklahoma. The Dust Bowl led to a mass displacement farmers and others dependent on the farming industry. About 800,000 people were displaced, and a significant portion of these were Okies. Despite the general term 'Okies' being used, not all who migrated were from Oklahoma, yet a substantial number did come from there.
Considering the options provided and the information that one in six Oklahoma residents left, the best estimate for the number of Okies from Oklahoma is likely b) About 250,000.