An example of applied power of congress is which of the following:
a) passing a tax law
b) establishing the federal communications commission
c) fixing the standards of weights and measures
d) establishing post offices

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.