You Are Writing to a Reader Who Favours a Different

You are writing to a reader who favours a different solution than the one you recommend.Which of the following strategies is MOST likely to persuade the reader?

A) Describe your reader's solution first; explain why it won't work; then go on to describe your own solution.
B) Ignore your opponent's solution, and just concentrate on your own.
C) Describe your own solution first.Then briefly say why your reader's idea won't work.
D) Go back and forth between solutions, contrasting step by step.