When measuring the volume in a graduated cylinder with a calibration of 100 mL, you should measure to the nearest milliliter. This means you would report the volume as a whole number without decimal points, for example, 30 mL or 50 mL.
Measuring to the nearest milliliter provides a good balance between precision and practicality. It allows you to accurately determine the volume of liquid in the cylinder without overstating the level of precision.
Choosing the nearest milliliter ensures that you are not reporting volumes with unnecessary decimal places that could potentially introduce errors or confusion in the measurement. It's a practical and precise way to represent the volume.
Therefore, the answer is:
A. the nearest milliliter
