Answer:
A) Mexico shares a border with the United States
Explanation:
United States have higher average compared to Mexico. (Average Americans typically earns two times more compared to Average Mexicans for the same job)
The average price for a same product in United States is far higher compared to the price of product in Mexico. So, by producing the drugs in Mexico and sell it to United States, drug cartels can obtain high amount of profit margin. This what cause the rise in Drug Cartels.