Historical sources for this civilization's mythology derives from texts like the Chilam Bilam from Guatemala. This civilization's most famous text describes the Lords of the Underworld in Xibalba, who were defeated in battle by Xbalanque and Hunahpu, the so-called Hero Twins. Those two brothers then became the Sun and the Moon. For 10 points, name this Mesoamerican civilization, whose mythology and creation story is described in the Popol Vuh.
a) Aztec Civilization
b) Inca Civilization
c) Maya Civilization
d) Olmec Civilization