The correct answer is B) farming.
The activity that began among gatherers in Mexico about 8,000 years ago was farming.
Species of corn were the first crops that Mesoamerican tribes started to many years ago. Historians considered that The Olmecs were the oldest American tribe that settled in what today is the Mexican territory. The Olmecs was a polytheistic cultured that honored many gods. One of the most important was the god of maize. They lived on the south part of the Gulf of Mexico in lands that today are the states of Veracruz and Tabasco. Agriculture was the most important activity for them and they grew squash, beans, and cocoa.