Who are we? 400 bce we don't know why they disappeared during a 50yr period the population nearly fell to zero most likely there were environmental changes that made area bad for farming possible that volcanoes erupted they left their mark by influencing the zapotec & the maya (e. g., ball game sacrifice etc.)

a) inca

b) olmec

c) maya

d) aztec

Explanation:

The Olmec were the earliest civilisation of Meso-America. They inhabited the tropical lowlands of south-central Mexico (Present day states of Veracruz and Tabasco). They flourished from 2500 BC to 400 BC, they practised ritual bloodletting and used to play ballgames. Olmec art work is most important aspect of their culture, they invented the writing system and calendar,due to these technological achievements they are called the mother civilisations of other cultures.

Archaeologists  consider human actions and ecological changes as being the reason for decline.  They relied of maize, sweet potatoes and squash for sustenance. It made them vulnerable to climate changes as climatic changes could have easily affected their favoured crops.

i believe the answer to your question is b. pay your bills early