The answer is A to your question
It was near a river which allowed many oppurtunities to gain resources from the water such as fish and to easily transport goods via waterways.
yes they still had slavery even if you stoped sooner does not mean you did not do something bad
The European country that first began looking for a sea route to India was Portugal.
This happened towards the end of the 15th century, somewhere during the reign of King Manuel I. The first voyager who went to look for India was Vasco de Gama. This paved the way for Portugal to become one of the most important explorers in the world.
The name of the site is: Hoyo Negr*o
The site is located in the underwater cave of Mexican Yucatan Pennisula. In that site, scientists have found the what they considered as the oldest skeleton in America (which is around 10,000 - 12,000 years old)
In spanish, the site is translated as "the black hole" because it's located in a very scary dark pit.