Final answer:
The service industry accounts for approximately 66% of all jobs in the United States, reflecting the nation's shift to a postindustrial service economy dominated by information-related activities.
Step-by-step explanation:
The service industry makes up a significant portion of the jobs in the United States. According to the various figures provided, services constitute over 60 percent of the production side components of GDP in the United States, indicating a postindustrial service economy. The transition into the information age during the latter part of the 20th century has resulted in a workforce primarily involved in information-related activities. By the beginning of the 21st century, the employment statistics showed less than 2 percent in agriculture, 15 percent in industry, 18 percent in services, and a substantial 65 percent in information activities. Therefore, the correct answer to the question regarding the percentage of all jobs in the service industry is approximately 66% (option c).