Final answer:
The density of the object is calculated by dividing its mass by the volume of water displaced. The correct density is 16.19 g/mL, which is not listed among the provided answer choices, indicating there may be an error in the question or options.
Step-by-step explanation:
To determine the density of the object, divide the mass of the object by the volume of water it displaces. The mass of the object is 421 g and the increase in the water level from 50.0 mL to 76.0 mL gives us the volume displaced, which is 76.0 mL - 50.0 mL = 26.0 mL.
Density = mass/volume
Density = 421 g / 26.0 mL
Density = 16.19 g/mL
The provided options do not include the correct answer, so there might be an error in the question or the options given.