Which Statement by a Patient with Uric Acid Stones Indicates

Which statement by a patient with uric acid stones indicates that the nurse's instruction about ways to prevent lithiasis was effective?

A) "I should avoid organ meats and sardines in my diet."
B) "I will increase purine-rich foods in my diet."
C) "The goal is to drink enough water that my urine is yellow."
D) "I will have to make my urine more acidic by eating cheese, cranberries, grapes, and tomatoes."