A form of agriculture in which people work small plots of land with simple tools is known as Beringia.
Horticulture.
Columbian exchange.
Encomienda system.
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Horticulture is the right option.

Explaination:

The real answer is Subsistence agriculture but it isn't given in the option and Horticulture is one of the example of Subsistence agriculture so it is right.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532.