What facilitated trading for the mayans?

a knowledge of mining

the lowland river system

the volcanic highlands

the proximity to 2 oceans

The lowland river system is the correct answer, If you think I wrote it wrong then you're wrong. I did it in my test and got it correct. The correct answer is The lowland river system.

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!

Its led to migrationits led to death