Answer:
El mecánico te muestra <u>sus</u> autos.
Explanation:
(of his) will be <u>theirs</u>
Ustedes is formal and should be used when talking to someone you’re not so familiar with, like a stranger, or someone that should be addressed with respect, like an elderly person.
The answer should be c. La criada because she is the maid. The paragraph says that she enters her clients houses, cleans the house, changes the sheets, that if they need anything she’ll help, bathroom services, and that she basically wants to make a good impression with her clients. Hope this helps. :)