Question

drug cartels pose a challenge in mexico because they have
caused drug - related violence and drug trafficking to increase.
exposed the widening income gap between rich and poor.
built schools in an effort to win support of the people.
bribed us government officials for extra protection.

Explanation:

To solve this, we analyze each option:

• Option 1: Drug cartels are known for engaging in drug trafficking, which leads to drug - related violence (like turf wars, violence against civilians and law enforcement). This is a well - documented challenge posed by drug cartels in Mexico.
• Option 2: The widening income gap in Mexico is more related to economic policies, historical inequality, and other economic factors rather than being directly caused by drug cartels.
• Option 3: Drug cartels are involved in illegal activities and do not build schools to win public support. Their activities are mainly centered around drug trade and related criminal acts.
• Option 4: While corruption related to drug cartels exists, bribing US government officials for extra protection is not the primary or most well - known reason for the challenge they pose in Mexico. The main domestic challenge is the increase in drug - related violence and trafficking within Mexico.

Answer:

A. caused drug - related violence and drug trafficking to increase.