I'm confused why this was taken down lol

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.

Select the correct answer from each 1. ( )was a nineteenth-century artistic movement that influenced nationalism in europe. it emerged as a reaction to the emphasis on 2. ( ) in enlightenment philosophy. 1. liberalism, socialism, romanticism 2. reason, emotion, religion

What from the columbian exchange had perhaps the biggest impact on the world?