Which of the following is a common side effect of benzodiazepines in older adults?

The correct answer is B: Increased risk of falls. Benzodiazepines are central nervous system depressants that can cause drowsiness, dizziness, and impaired coordination, leading to an increased risk of falls in older adults. This is due to the sedative effects of benzodiazepines, which can affect balance and motor skills. Increased alertness (choice A) is not a common side effect of benzodiazepines, as they typically have a calming and sedating effect. Improved memory (choice C) is also unlikely, as benzodiazepines are more commonly associated with memory impairment. Enhanced muscle strength (choice D) is not a known side effect of benzodiazepines, as they do not directly affect muscle strength. In summary, the correct answer is B because benzodiazepines can increase the risk of falls in older adults due to their sedative properties.