Final answer:
The test system that allows for standardization of initial sample volumes and distribution of elements on the slide is Clinitest.
So, the correct answer is d. Clinitest.
Step-by-step explanation:
Clinitest is the test system that allows for standardization of initial sample volumes and distribution of elements on the slide. Clinitest is a test system used to determine the presence of reducing substances in urine, such as glucose. It involves heating a urine sample with Clinitest tablets, which contain a copper sulfate reagent. If reducing substances are present, the color of the solution changes, indicating a positive result.
So, the correct answer is d. Clinitest.