Final answer:
The nurse should identify the statement 'I should drink plenty of water with this medication' as an indication that the client understands the teaching.
Step-by-step explanation:
The nurse should identify the statement c) 'I should drink plenty of water with this medication.' as an indication that the client understands the teaching. Drinking plenty of water helps to prevent crystallization of the medication in the urinary tract and promotes effective drug clearance from the body. This is important for the treatment of a urinary tract infection.