Question

what were two practices used to develop monopolies?
charging tariffs for crossing state lines and limiting transportation distances
controlling all the steps in production and limiting transportation distances
driving out all business competitors and charging tariffs for crossing state lines
controlling all the steps in a business process and driving out all the competitors

Explanation:

Monopolies are developed by eliminating competition and controlling the entire business - process. Driving out competitors reduces market rivalry, and controlling all business - process steps gives a firm complete control over production, distribution, etc. Tariffs for crossing state lines and limiting transportation distances are not typical primary monopoly - building practices.

Answer:

controlling all the steps in a business process and driving out all the competitors