The best sentence to provide evidence supporting the statement about mobility dogs helping those who are mobility impaired is:
A. For example, they can be trained to retrieve items, open and close doors, turn lights or appliances on and off, tug socks and shoes off, hand money to the store clerk, call 911, and much more.
This sentence clearly outlines the specific tasks that mobility dogs can be trained to perform, which directly supports their role in assisting individuals with mobility impairments.