A 45-year-old woman with systemic sclerosis presents with progressive dyspnea. Hemodynamic catheterization confirms pulmonary arterial hypertension (mPAP 35 mmHg, PCWP 12 mmHg, PVR 4.2 Wood units). She undergoes a six-minute walk test as part of risk stratification. The distance marked **A** in the diagram (<332 m) is achieved. Which of the following best describes the prognostic significance of this finding?
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