What is the sufficient amount of urine in milliliters required for testing?

The correct answer reflects the minimum volume requirements for urine testing, which is crucial for accurate diagnostic results. In clinical practice, a sufficient urine sample typically needs to be at least 60 milliliters for comprehensive testing, ensuring that there is enough volume for various analyses, such as screening for drugs, checking for infections, or analyzing kidney function.

The presence of 30 ml and 15 ml represents the volumes sometimes necessary for specific subsets of tests or initial screenings, ensuring that even smaller tests can be performed if needed. The combination of 45 ml and 15 ml can be seen in other contexts, but that doesn't meet the comprehensive testing standard.

With this key volume in mind, answer B provides a balanced approach ensuring both sufficient total volume for comprehensive testing and the presence of smaller volumes that may be required for specific assays. This rationalizes why it meets the requirements for a variety of testing protocols while ensuring accurate results.