Anger in response to insults is unreasonable, for insults are merely assertions that someone has undesirable characteristics.
Conclusion
Anger in response to insults is unreasonable.
Evidence (for)
Insults are merely assertions that you have an undesirable characteristic.
If the assertion is false, you should pity the person insulting you. If the assertion is true, you should be grateful for such useful information.
Evaluate
Since the Conclusion is about "anger / unreasonable response" but the evidence never once mentioned "anger / unreasonable response", we can be 99% sure that the correct answer will contain that language.
The author has laid out a binary case, arguing that In Either Case it would be unreasonable to respond with anger.
We might object,
Goal
We need an answer saying,
or something weirder like, (that would allow us to infer that if we ought to pity, we ought not to have any other response, such as anger)