Ken, the agent, violated the law of agency
In this particular instance, when Ken told the the buyer that the seller would take a lower price than what was on the listing in order to close the sale faster and then told the buyer exactly which price they should offer, Ken, who is the agent, has now violated the law of agency
B. They'll know exactly what you want.
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Both A and C are almost required to communicate a complex idea. A. pulls the person into actually listening and C makes your idea comprehensible. If I had to go with one or the other, I would emphasize A since it makes certain that the person pays attention. However, putting into consideration that your teacher would likely not want that answer, I would instead go with C.