Final answer:
The British government secured access to oil during World War I by purchasing a majority stake in the Anglo-Persian Oil Company.
Step-by-step explanation:
The correct answer is Anglo-Persian Oil Company. During World War I and beyond, the British government ensured secured access to oil by purchasing a majority stake in the Anglo-Persian Oil Company, which later became BP. By controlling this company, the British government could maintain a reliable source of oil for their military operations and strategic interests.
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