Final answer:
The density of the metal is 6 g/ml.
Step-by-step explanation:
The density of a substance can be calculated using the formula: density = mass/volume. In this case, the mass of the metal is given as 48 grams, and the volume is the difference in the water levels in the graduated cylinder, which is 33 ml - 25 ml = 8 ml. So, the density of the metal is 48 g / 8 ml = 6 g/ml. Therefore, the correct answer is a) 6 g/ml.