Answer:
The correct answer is the option B: an emotional appeal using guilt to persuade the reader to do what is right.
Explanation:
To begin with a persuasive request is a type of formal letter used in order to obtain an estimated result in the reader, therefore that this type of letter looks forward to get through the reader using emotional situations that make the reader understand the correct answer or way to act, and by doing this the writter also tends to make the reader feel affective by the situation proposed in the letter. That is why this type of letter includes many emotional information in order to achieve the goal of getting to the reader persuasively.
