Final answer:
The b. Aztec Empire was in present-day Mexico, while the a. Mayan Empire was located on the Yucatan Peninsula.
Step-by-step explanation:
The Mesoamerican empire located in present-day Mexico is the b. Aztec Empire. The Aztecs expanded their control over central Mexico from their capital city of Tenochtitlán and practiced human sacrifice as a religious ritual.
The a. Mayan Empire, on the other hand, was situated in the Yucatan Peninsula. They developed into a civilization with large cities, characterized by flat-top pyramids and garden cities in the jungle.