Ａ.Irritation is a feeling when we expect something frustrating.<br>
Irritation or impatience is felt when we can't remember the answer to a question on a test but time is almost up, or we are not making progress on studying for an upcoming test. Irritation occurs due to expecting frustration.<br>
If people feel irritation, they become unpleasant, extremely tense, and excited.<br>
Irritation is different from dissatisfaction in that the actions are only directed to one's self.<br>
Excessive tension from irritation often makes people respond wrongly, therefore irritation has little value in evolution. Having muscles tensed for fighting is especially useless during an exam.<br>
Irritation is unpleasant so it encourages preparation to avoid it, which is the only positive effect.