Portugal's empire was extensive, and the country thrived on: corn from the new world trade the adventures of exploration being rejected by foreign countries

The correct option is: trade.

Explanation

Portugal's empire was extensive, and the country mostly thrived on trade. In fact, they had a big commercial network with other countries.

Moreover, their main source of trade income was Brazil, since they exported diamonds, slaves and other goods too.

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when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.