Final answer:
If both d and s represent lengths with units in inches, then d/s would result in a dimensionless number as the units would cancel out, hence the correct answer is D. No Unit.
Step-by-step explanation:
If s is measured in inches (in) and v is measured in cubic inches (in3), then the unit for d/s should be analyzed in relation to these measurements. Since we don't have a variable d defined in the question, we assume that d represents a derived unit that also involves length, consistent with the mention of measurement units. However, without a specific definition for d, we cannot provide a definitive unit for d/s. If we consider d as a distance or length measured in inches, the division of d by s (also in inches) would result in a dimensionless number, as the inches unit would cancel out. Hence, the appropriate unit in this case would be D. No Unit.