Final answer:
The law of primacy suggests that primary information presented in a message has the most effect on persuasion.
Step-by-step explanation:
The law of primacy suggests that the order of presentation of messages can influence persuasion. According to the law of primacy, a message presented first produces the most persuasion when the messages are given back-to-back without any delay. However, if there is a delay between the messages, the last message presented tends to be more persuasive.
In terms of the content of the message, the law of primacy suggests that primary information presented in a message has the most effect on persuasion. This means that information presented at the beginning of a message is more likely to be remembered, understood, and have a greater impact on the intended audience.
Therefore, the correct answer to your question is d. Primary information presented in a message has the most effect on persuasion.