3. Which country took the lead in
European exploration?

Portugal

Explanation:

Was one of the primary players in the European Age of Discovery and Exploration.  Portugal took the principal role during most of the fifteenth century in searching for a route to Asia by sailing south around Africa.

a.) d-day invasion of normandy.

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herodotus taught this. herodotus was an ancient greek historian who was born in halicarnassus in the persian empire. he is known for having written the book the histories, a detailed record of his "inquiry" on the origins of the greco-persian wars.