Final answer:
To determine the density of a crayon relative to water, one would need to know if it floats or sinks in water. Since this information is not provided, the density of a crayon cannot be determined.
Step-by-step explanation:
When comparing the densities of different substances to determine whether they will float or sink in water, it's important to know that water has a density of 1.0 g/mL. Substances with densities less than 1 g/mL, such as oil with a density of 0.93 g/mL, will float on water, while substances with densities greater than 1 g/mL will sink. Therefore, if a crayon floats in water, we can conclude that its density is less than 1 g/mL, while if it sinks, its density is greater than 1 g/mL. Without additional information about whether the crayon floats or sinks in water, the density of a crayon cannot be determined (d).