Final answer:
The volume of the rock is found by subtracting the volume of water alone from the total volume with the rock, which equals 0.8 mL, corresponding to option A).
Step-by-step explanation:
To find the volume of the rock, we will subtract the volume of the water alone from the volume of the water and the rock together. The volume of the water alone is given as 4.8 mL, and the volume when the rock is added is 5.6 mL.
Therefore, by subtracting the volume of the water from the combined volume, we calculate the rock's volume:
5.6 mL (water + rock) - 4.8 mL (water alone) = 0.8 mL.
Thus, the volume of the rock is 0.8 mL, which corresponds to option A).