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Option 3: "transportation"
Explanation: The text indicates that large movements of people were made possible by new, cheap, and fast means of transportation. This directly aligns with the context of the migrations discussed, as transportation is essential for moving large populations across continents.
Option 1: "transition"
Explanation: The term 'transition' refers to a change or shift from one state to another. In the context of the text, it does not relate to the means that facilitated mass migrations. The text discusses how large movements of people were made possible by new means, specifically in terms of travel, which 'transition' does not address.
Option 2: "internet"
Explanation: While the internet has transformed communication and information sharing, it is not relevant to the context of mass migrations in the nineteenth century. The text focuses on physical movement of people, and the internet did not play a role in facilitating these migrations.
Option 4: "airlines"
Explanation: Although airlines are a form of transportation, they did not exist in the nineteenth century when the migrations mentioned occurred. The text refers to the means of transportation available during that time, which would not include airlines.
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