A researcher claims that the median weekly hours worked by employees in a certain city is less than the national median of $38.5$ hours. The data collected from a random sample of employees in the city is quantitative, but the distribution is unknown. Which statistical test should be used to evaluate the researcher's claim about the median weekly hours?

• A. Paired $t$-test
• B. One-sample sign test
• C. Two-sample $z$-test
• D. ANOVA