A primary source of anything is a first hand account be it a diary, eye witness account, the person must have experienced it themselves while a secondary the information could have been passed on for example a news paper or memoir on someones life.
D) Growing fruit and vegetable crops
A.) They sat in front of the bus and used 'white' restrooms in bus stations.
One of the most desired spices, undoubtedly is cinnamon, because it has specific properties,such as preservative, particularly to preserve meat due to its antibacterial characteristic, another reason for being used by physicians to treat cough and sore throats among others.
It comes from Sri Lanka, before called Ceylon (Cinnamomum zeylanicum). Spices were so expensive, that this inspired Cristopher Columbus to find an alternative route to India to obtain them, because this would be a cheaper enterprise than buying them from middlemen and European monopolies.