Which of the Following Is the Most Likely Reason for the Loss

Which of the following is the most likely reason for the loss of Olmec urban centers in the middle of the first millennium BCE?

A) The Olmec population dropped drastically, because of a prolonged drought.
B) The Olmecs were invaded and conquered by the Toltecs, as seen by the destruction of many ritual centers.
C) The machinery for bringing resources to the Olmec capitals failed, leading to the collapse of the social and cultural hierarchy.
D) The Olmec rulers claimed to descend from divine ancestors, angering the priestly class.