It is a verb!! Hope it helped!! :)
The Olmecs were the first major civilization in Mexico following a progressive development in Soconusco. They lived in the tropical lowlands of south-central Mexico, in the present-day states of Veracruz and Tabasco. The natural <span>feature was important to the olmec people of san lorenzo are RIVERS. T</span><span>hey used rivers to travel between cities and build a strong trade system.</span>
I believe B would be best.
