Choice A is wrong because hypertension is not a common adverse effect of bupropion. However, bupropion can cause tachycardia, agitation, insomnia, and headache.

Choice B is wrong because bradycardia is not an adverse effect of bupropion. Bupropion can cause tachycardia as a result of its stimulating effect on the central nervous system.

Choice C is wrong because diarrhea is not an adverse effect of bupropion. Bupropion can cause dry mouth, constipation, nausea, and vomiting.

Seizures. According to web search results, bupropion (Wellbutrin) is an antidepressant that can lower the seizure threshold and increase the risk of seizures in clients who have a history of head injury, brain tumor, or eating disorders. Therefore, the nurse should monitor the client for any signs of seizure activity and report them to the provider.