What is the importance of geogaphy on river valley civilizations?

How would i answer this for an exam?

Acompany produces items in small batches. the machinery needs to warm up before the items can be produced. the scatterplot shows the time needed to produce batches of different numbers of items. based on the line of best fit, which of these statements is true?

The meseta in spain is a a. navigable river b. castle c. coastal plain d.plateau