The great depression started when banks gave out risky loans where people invested the money they got into the stock market; when the stock market crashed everyone lost their money. It all ended when the president at the time make a ton of programs to bring jobs into America and help people if they did not have a job.
"A" would be the correct answer. Even though the main goal of the voyage was to find a different sea route to Asia. Bartolome and other Portuguese explorer have also made stops along the African coast and started to realize how could of an alternative they would be compared to the Mediterranean trade routes
These are all pretty edgy answers, so I hope I am right xD
It would take about 25 minutes because 5•4 is 20 and each time around is 6 minutes.