I think that these are the answers for your questions.
3. B
4. B
C. engaging in a style of publishing called "yellow journalism"
Both men were newspaper publishers and in the late 19th century, their papers began to compete with each other. As a result they began to use "yellow journalism" (which is a lack of substantial, researched news combined with flashy headlines) to gain a larger readership.
Answer:
Industrial expansion and population growth radically changed the face of the nation's cities. Noise, traffic jams, slums, air pollution, and sanitation and health problems became commonplace. Mass transit, in the form of trolleys, cable cars, and subways, was built, and skyscrapers began to dominate city skylines.
Explanation:
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