Answer:
d. petroleum extraction.
Step-by-step explanation:
- The mining and the manufacturing industry employs about 11% of the world force that accounts of about 23% of the Mexico's GDP and in which oil is the most important and provides about 30% of the Mexico export earning and thus about 5% of the oil is exported to the united states and it's controlled by a government agency known as the PEMEX. And Mexico accounts for about 7% of world reserves of oil.