The best sentence to provide evidence to support the underlined statement about how service dogs assist those that 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 specifically outlines the tasks that mobility service dogs can perform, demonstrating how they assist individuals with mobility impairments.