Which of the following clients should most likely be assessed for orthostatic hypotension?

Which of the following clients should most likely be assessed for orthostatic hypotension?
 
  A) A 78-year-old woman who has begun complaining of frequent headaches unrelieved by over-the-counter analgesics
  B) A 65-year-old client whose vision has become much less acute in recent months and who has noticed swelling in her ankles
  C) An 80-year-old elderly client who has experienced two falls since admission while attempting to ambulate to the bathroom
  D) A 42-year-old client who has a history of poorly controlled type 1 diabetes