A 72-year-old woman presents with a severe headache and tenderness over the temples. She reports no obvious trigger and has had this pain for the past week. She has noticed some blurred vision in the left eye and difficulty opening her jaw when eating. The patient's neurological examination is normal. What is the most important initial step in the management of this patient?

A. Administer high-dose oral prednisolone

B. Arrange an urgent MRI for suspected cerebral aneurysm

C. Arrange an urgent temporal artery biopsy

D. Arrange an urgent CT head

E. Ocular pilocarpine + intravenous acetazolamide

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