单选题 If the author's assessment of the use of heat pumps is correct, which of the following best expresses the lesson that advertisers should learn from this case?______

A、 Do not make exaggerated claims about the products you are trying to promote.
B、 Focus your advertising campaign on vague analogies and veiled implications instead of on facts.
C、 Do not use facts in your advertising that will strain the prospective client's ability' to believe.
D、 Do not assume in your advertising that the prospective clients know even the most elementary scientific principles.

【正确答案】 C

【答案解析】第一段指出，广告商关于热泵的宣传是违背能量守恒定律的。最后一段也指出热泵的致命弱点：在极其寒冷的气候，当需要最大热量时，热泵却不能提供足够的热量。