Final answer:
In 1917, Mexico adopted a new constitution focusing on land reform, aimed at addressing inequalities that sparked the Mexican Revolution. The correct option is b.
Step-by-step explanation:
In 1917, Mexico adopts a new constitution to ensure land reform in the country. This pivotal event in Mexican history happened as the country emerged from the tumultuous period of the Mexican Revolution. Under President Lázaro Cárdenas, Mexico implemented significant land reforms in the 1930s, redistributing land to peasants and enacting policies that favored the working class. The land reform aimed to rectify the inequalities in land distribution that had been a significant cause of the Mexican Revolution.
The correct option is b.