The explorer who first found a way around South wad Ferdinand Magellan<span> (a Portuguese explorer)</span>
To fight and gain land and supplies. And more space for the troops
I would also say that D. to obtain identification cues and other information is the correct answer here.
When dogs investigate other dogs' feces and urine, they do that for the same reason why we might browse through a person's Facebook profile - they want to see what kind of a dog was there and to gather data on the canines who live in or pass through that area.
"c. A narrative source" is what a historian would use to get a firsthand account of a past event, since in these sources (which are also primary sources) a person is giving a first-hand account of the event itself.
The event that occurred in the 4th Crusade was the Crusaders attacked Constantinople. The sack of Constantinopea took place in April 1204, during the 4th Crusade. The Crusaders attacked, destroyed and robbed during the assault of Constantinople. (Hope this helps! :)