Final answer:
The most accurate volume measurement when reading a graduated cylinder is obtained by looking at the bottom of the meniscus at a 90-degree angle. This minimizes parallax error and distortion in readings. So, the answer is C) Looking from a 90-degree angle.
Step-by-step explanation:
To obtain the most accurate volume measurement when reading a graduated cylinder, we need to consider the position of our eyes relative to the liquid's surface. The correct way is to align our eyes at the same level as the liquid inside the cylinder. When we do this, the liquid will form a curve known as a meniscus, and we must read the volume at the bottom of this meniscus. Based on the options provided, looking from a 90-degree angle—essentially having your eye directly at the level of the meniscus—will yield the most accurate reading because it minimizes parallax error, which is the apparent shift in the position of the level of liquid when viewed from an angle.
It is incorrect to measure the volume by looking down directly from the top (A) or from any other angle such as 45 degrees (B) or 30 degrees (D). These angles will distort the true volume due to the parallax effect. So, the answer is C) Looking from a 90-degree angle.