1) Oil prices and economic inefficiency.
Yamani, declared that Saudi Arabia was quitting the agreement on oil production restraint, and started to boost its share in the oil market. After this, Saudi Arabia increased oil production by 5.5 fold, and oil prices dropped by 6.1 fold,
2) ethnic tensions
3) Gorbachev’s reforms
I believe that the correct option is C; the source of the passage is likely to be biased because the author is an example of the people he writes about.
Andrew Carnegie was a businessman native from Scotland, he emigrates to USA when he was a kid and at the early age of 18 he started working from the Pennsylvania Railroad Company, before that he had been working since he was 13 when he arrived United States but in the Railroad Company was where he stand out. At the age of 20 he was already the manager and apprentice of Thomas Scott, the owner of the company. Later he created the Carnegie Steel Company to be more focus on the iron business, he also had bought mines near the Pittsburgh area. That was the beginning of the construction of a big iron empire. Finally the Carnegie Steel Company was sold to JP Morgan in 1901 for $480 million dollars and there is were the philantropist career of Carnegie started.
Even thought he paid the minimun wage during his years as industrial, Andrew invest almost half of his salary in the creation of libraries, schools, universities and a trust fund for the oldest employees.
As a philantropist he donated money to different causes but his favorite was the construction of libraries troughout all America. He also give millons of dollars for the reconstruction of Johnstown Pennsylvania after a flood that he felt responsible for. And finally he build in Manhattan the famous Carnegie Hall.
