Which of the following measures may have the greatest impact overall in the prevention of falls in the elderly?

A) Vision checks every 5 years
B) Regular exercise
C) Wearing wool socks
D) Night lights

Regular exercise has been shown to improve strength, balance, and coordination, which are all important factors in preventing falls in the elderly. Vision checks, wearing wool socks, and night lights may also be helpful, but regular exercise has the greatest impact overall.