Which of the following indicates a strong verbal protest or complaint?

The correct choice, Harangue, accurately describes a strong verbal protest or complaint. A harangue is characterized by a lengthy and aggressive speech or piece of writing that criticizes or expresses strong opinions. Typically, it is delivered with a sense of urgency and intensity, often in a public setting, and can convey a deep level of frustration or anger about a particular issue.

This term is rooted in both the emotional weight it carries and the public nature of delivering such a protest, making it a more specific and potent descriptor of a vehement expression of dissatisfaction compared to the other options.

While Assertion refers to a confident statement or declaration, it doesn't inherently carry the weight of protest. Argument generally implies a logical presentation of reasons, which may or may not involve strong feelings. Reproach does indicate disapproval but is often more about expressing disappointment or blame without the same level of fervor and length associated with a harangue. Thus, Harangue stands out as the most accurate portrayal of a strong verbal protest.