Answer: C. the carving of huge stone head sculptures
Step-by-step explanation:
The carving of huge colossal heads is attributed to the Olmecs, a civilization of ancient Mesoamerica that was the predecessor of the Mayas, Incas and Aztecs.
It should be noted that these sculptures had mostly features that did not match the Amerindian features of the inhabitants of those lands at that time, which still represents a mystery to be solved.
Therefore, the correct option is C.