A) - no, we haven't stopped eating meat, even though we do have a surplus of food! b) - yes, this is true! if there was a surplus of food, not everyone has to produce food and some people can do other tasks! correct answer! .. so we don't have to look further:)
A) and B) are both correct. Silk and salt were not the main items traded in Ghana, and Ghanaian blacksmiths didn't produce high quality trade goods out of copper and tin