Final answer:
The ad strategy that puts the strongest points at the end is using the b) recency effect, where the last message heard is most persuasive, especially after a delay.
Step-by-step explanation:
The ad that places the strongest points at the end of the message assumes the recency effect, in which the last message is the most persuasive. According to research, if there is a delay after the first message, and before the audience makes a decision, the last message presented tends to have a greater persuasive impact. This is highlighted by Miller & Campbell in their 1959 study on recency and primacy in persuasion, indicating that the timing of messages influences their effectiveness.