For many cities in the region of texas, spanish is the primary language, catholicism is the dominant religion, and international trade is an increasingly important part of the economy.

For many cities in the Border region of texas, spanish is the primary language, catholicism is the dominant religion, and international trade is an increasingly important part of the economy.
Texas is directly bordered with Mexico. So along the border region, people started to assimilate with Mexican culture and started to speak spanish. This region is an important part of economy, becase many oil and agricultural products are traded through this region.

The answer to your question would be b