Final answer:
The client will indicate that teaching has been effective by stating that they will take their diuretic medication as prescribed.
Step-by-step explanation:
The correct statement by the client that indicates effective teaching is 'I will take my diuretic medication as prescribed.'
Metabolic alkalosis can be caused by the loss of hydrogen and chloride ions, which can occur with vomiting and the use of diuretics. By taking the diuretic medication as prescribed, the client is addressing the underlying cause and reducing the risk of developing metabolic alkalosis.
The other statements are not related to the prevention of metabolic alkalosis. Limiting intake of citrus fruits, including more dairy products, or drinking plenty of water may have other health benefits, but they do not specifically address the risk of metabolic alkalosis.