This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to trade candy
Understanding the basics of trading.
You do not need to understand more than the basics of market forces to excel on the market. Understanding the core of the market will help you to decide on what your next move is.

Available options:
[A]. The relationship between supply, demand and price is a good starting point. These two principals are the basis for any market : Relationship between supply and demand.;
[B]. Use pricing technology and soft techniques to improve business. Research pricing on all before you settle on a vendor, image/even form of material to trade.;
[C]. For example, dealers, organizers, bargains officers, and craft dealers are all people willing to trade with you or against you. Settling into a well-organized base with no major settlements are all you need to be strong in order to live a healthy lifestyle.;
[D]. You may need to pick your largest preferred candies to trade with. This may include using pistils, candy crates, textures, and other relatively new items.;
The answer is:
[A].