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Before deciding which of the given options is an untoward effect of angiotensin-converting agents, it is necessary to list the known side effects of such medications. Angiotensin-converting agents (ACE inhibitors) are commonly used in the treatment of hypertension and heart failure and are known for their side effects such as dizziness, nausea, edema, and cough.

List and evaluate the given options one by one for any indication that should be reported to the doctor: A. Postural dizziness - This is a common side effect of ACE inhibitors due to the drop in blood pressure they cause. However, it is not necessarily untoward and may not require immediate medical attention. B. Occasional nausea - Nausea can also occur as a side effect but is usually mild and does not require medical attention unless severe or persistent. C. \(1+\) petal edema - Edema, particularly in the lower extremities, is a common side effect of ACE inhibitors but usually does not require medical attention unless it worsens or persists for an extended period. D. Persistent hacking cough - This is a well-known side effect of ACE inhibitors known as the "ACE cough." It can be very bothersome to patients, interfere with daily activities, and might indicate an allergic reaction or lung issue. This symptom should be reported to the doctor as it may require a change in medication or further investigation.

Based on the evaluation, it can be concluded that option D (Persistent hacking cough) is the untoward effect of angiotensin-converting agents that should be reported to the doctor.