The position at the top of the maya social class structure was filled by a. commonersb. kingsc. priestsd. slaves   

The correct answer is option B. The position at the top of the Maya social class structure was filled by the kings.

Explanation:

The Maya social was structured as by the hiercharchy. The top tier were the kings who were considered as the most important, elite class. They lived in the palaces and had the best possible lifestyle money could buy at that time.

After the kings came the priests, who also lived with kings inside the palaces. Since the priests were also important part of their upbringing. After the priests came the nobles and wealthy people who had considerable influence.  

Then came the commoners and the slaves who were considered as the most lowest of the hierarchy.

protected civil liberties and outlawed slavery in the new territories.