Which of the following conclusions about global economics in 1900 is best supported by the passages? Advances in transportation and manufacturing

Which of the following conclusions about global economics in 1900 is best supported by the passages?

Advances in transportation and manufacturing contributed to the development of an interconnected global economy based on trade and the specialization of labor.
Innovations in manufacturing had allowed most developed nations to become economically self-sufficient, reducing international trade and eliminating the need for labor specialization.
Changes in transportation allowed nations to trade freely with one another; however, strict practices of labor specialization restricted trade by socioeconomic class.
Innovations in transportation and manufacturing were limited to only the wealthiest elites, which dramatically widened the gap between rich and poor nations.

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