A good few there's the good ole' compass and maps, the astrolabe(to determine the altitude of the sun and other heavenly bodies), the crossstaff (also for measuring the altitude of celestial bodies), and the sextant (which is the innovated replacement of the astrolabe)
D. A good that takes a long time to produce, is expensive and can be made with only a few available resources
He has or was most likely Kidnapped from his home in Ghana.
Answer:
Cotton was a very important and special crop in the South because it was one thing they can actually trade with other countries. They could even trade cotton with the North.
Hope it helps!