Which of the Following Is a Conclusion That Can Be

Multiple Choice

Which of the following is a conclusion that can be drawn from research with respect to what it takes for television advertising to successfully enhance a brand's sales performance? 

A)  ad copy must be distinctive 
B)  ad weight without persuasiveness is insufficient 
C)  the selling power of advertising wears out over time 
D)  advertising works quickly if it works at all 
E)  All of these are correct.