Answer 1 =B

Falls are one of the most common geriatric syndromes threatening the independence of older persons. Between 30 and 40 percent of community-dwelling adults older than 65 years fall each year, and the rates are higher for nursing home residents.
Falls are associated with increased morbidity, mortality, and nursing home placement. Most falls have multiple causes. Risk factors for falls include muscle weakness, a history of falls, use of four or more prescription medications, use of an assistive device, arthritis, depression, age older than 80 years, and impairments in gait, balance, cognition, vision, and activities of daily living. 
The most common causes of falls in older persons are: Accidents and related environmental causes 31%; Gait or balance disorders or weakness 17%; Dizziness and vertigo 13%; Posterior circulation disorder or “drop attacks” 9%; Confusion 5%; Postural hypotension 3%; visual impairments (usually greater deficit than 20/60 vision) 2%; and syncope 0.3%. See Rao, SS. Prevention of Falls in Older Persons. Am Fam Physician 2005;72:81-8,93-4; and Rubenstein LZ, Josephson KR. The epidemiology of falls and syncope. Clin Geriatr Med 2002;18:146.