Part A:
What occurred in the passage? A. economic specialization
B. investment in human capital
C. economic globalization
D. investment in entrepreneurship
The correct answer is A. economic specialization.
The passage describes how the oil company shifted its focus from drilling and extracting crude oil to specializing in refining crude oil, which indicates a move towards economic specialization.
Part B: (please provide the question for Part B so I can assist you further)