Many of the Urinary Antiseptics Work Best with a Specific

Many of the urinary antiseptics work best with a specific urine pH. What are the optimal pH and a method to achieve this pH?

A) pH of 4.8, treatment with vitamin C
B) pH of 6.0, treatment with cranberry juice
C) pH of 6.1, treatment with milk
D) pH of 5.5, treatment with antacids