To offer medical assistance to Third World countries.
The imperialism movement of the 19th century did not show particular concern for the native peoples in the regions they came to control through imperialistic means. There were medical missions and religious missions that accompanied the imperialistic advance into other countries, but those were factors that accompanied the imperialistic advance more than they motivated it.
Also, as a false component of that option, the term "Third World" didn't come into existence until the era of the Cold War. The "Third World" referred to the developing nations that did not align with either of the superpowers, the USA or the USSR. No one was using the term "Third World" in the 19th century.
I am not going to answer in a paragraph of 125 words, but I will give you the answer to the first question; The United States didn't want another country to fall to communism. They officially got involved after the attack of the Gulf of Tonkin (U.S destroyers were stationed there and a radio came in that said they had been fired upon by North Vietnamese forces). (45 words BTW).
A. Natural disasters, such as tsunamis, earthquakes, and floods
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Answer:
Nomads
Explanation: Nomads were the earliest humans from Africa, while hunter-gatherers developed during the Neolithic era.
Alexander Graham Bell was a Scottish-born inventor, scientist, and engineer who is credited with patenting the first practical telephone.