Why was it challenging for the Zapotec to expand their civilization?

(1 point)
• The Oaxaca Valley is surrounded by mountains.
• The Andes Mountains were too steep.
• The Yucatán Peninsula is too swampy.
• The Guatemalan jungles were too thick.

The correct answer is:

- The Oaxaca Valley is surrounded by mountains.

The presence of mountains around the Oaxaca Valley made it challenging for the Zapotec civilization to expand.