The answer is "D. Domestic trade".
Domestic trade, otherwise called internal trade or home trade, is the trading of residential products inside the limits of a nation. This might be sub-separated into two classes, discount and retail. Wholesale trade is concerned about purchasing products from makers or merchants or makers in expansive amounts and pitching them in littler amounts to other people who might be retailers or even buyers. Wholesale trade is embraced by discount vendors or discount commission agents.