State a final answer with correct units, interpretation, and reasonableness justification when the context requires it.
Choose the strongest complete contextual response
Problem
A \(186\text{-}\text{mile}~\text{trip}\) at \(31~\text{miles}~\text{per}~\text{gallon}\) with gas at \(\$3.80~\text{per}~\text{gallon}\) costs \(\$22.80\). Which complete evaluation is correct? A gives only \(6\); B gives \(\$22.80\) with computation; C gives \(\$22.80\) with units, trip-cost context, and a reasonableness check; D gives \(31~\text{gallons}\) and \(\$117.80\).
Big Picture
What this problem is really about
Use a completeness checklist, not just numerical agreement. Recompute gallons by dividing distance by fuel economy, convert that amount to dollars using price per gallon, and estimate with a nearby price to test scale. Then compare each student's response for the correct value, dollar units, trip-cost meaning, and an explicit reasonableness check.
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