What economic opportunity was the primary cause of andrew carnegie's opportunity for fortune? a. the market for iron and steel for infrastructure construction such as train tracks and bridges b. improvements in the ways in which wooden bridges and buildings were constructed c. the discovery of oil and the invention of the gas-fired engine d. world war i and the need for ships and ammunition

Why did orson welles change the beginning of the war of the worlds for his radio broadcast? a. to capture the attention of his listeners, who may have been doing other things b. to get around copyright laws associated with using material from a published book c. to ask members of the audience to call family and friends and encourage them to listen d. to remind listeners to call police for more information