Which of the following is a set of signs and symptoms associated with Vertebrobasilar insufficiency (VBI)?

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Vertebrobasilar insufficiency affects the posterior circulation that feeds the brainstem, cerebellum, and occipital lobes. Because of that, the signs reflect involvement of multiple brainstem and cerebellar functions: dizziness or vertigo, double vision (diplopia), slurred speech (dysarthria), difficulty swallowing (dysphagia), sudden falls or loss of consciousness (drop attacks/DLOC), nausea, numbness, and nystagmus. This combination captures the broad, multi-system presentation typical of posterior circulation insufficiency, not just a single symptom set. The other options are too limited—one lists only dizziness, another only headache and neck pain, and another only visual disturbances—so the comprehensive set including these diverse signs best fits VBI.