Which symptom would indicate severe anxiety in a client?

The indication of severe anxiety in a client is often represented by intense and overwhelming feelings such as panic or dread. When a person experiences horror, it typically suggests a heightened state of fear or distress, which can be associated with severe anxiety. This symptom is beyond general worry or restlessness and points to a more profound level of emotional turmoil that can disrupt a person's ability to function normally.

In contrast, restlessness, intense worry, and feelings of control may reflect varying levels of anxiety but do not necessarily indicate the severity that horror represents. Restlessness can be a common symptom of milder anxiety, while feelings of control suggest a level of stability rather than distress. Intense worry, while significant, often does not reach the extreme emotional state reflected by the feeling of horror, which suggests a drastic impact on the individual's mental state.