题目选项分析

Unlike other Mayan cities, Cancun's commercial power throughout the lowlands seems to be from using its strategic position at the foot of the highlands, which were a source of jade, obsidian, and other valuable commodities.

Unlike other Mayan cities, Cancun seems to have used its strategic position at the foot of the highlands, a source of jade, obsidian, and other valuable commodities, to become a commercial power throughout the lowlands.