The best sentence to provide evidence to support the underlined statement about how service dogs help 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 offers specific examples of the tasks that mobility dogs can perform to assist individuals with mobility impairments, thus strengthening the argument in the paragraph.