The correct answer is b) banking, oil, and telecommunications
During the Reagan Presidency, Banking, Oil and telecommunications were deregulated.
President Ronald Reagan was a popular republican who believed in the free market system and the freedom of businesses and people to be entrepreneurial and pursue their dreams.
President Reagan believed that the banking sector, the oil industry and the telecommunications sector were valuable to the economy and could create millions of jobs and increase the country's export.
Hence, he sought to deregulate these industries and limit government interference in their operations.
His policies were lasting and within a few years, American banking, oil and telecommunications were global leaders.