Which of the Following Is True of the Pennsylvania Oil

Which of the following is true of the Pennsylvania oil rush?

A) In terms of economic importance, it outweighed the California gold rush of a decade before.
B) It gave J. Pierpont Morgan his start in business and helped establish him as a tycoon.
C) It ended the monopoly in petroleum production that Oklahoma had enjoyed for half a century.
D) It had little impact on everyday tasks because oil could not yet be refined for cooking and heating.
E) It illustrated to many Americans that a dependence on oil might prove problematic in the future.