While researching city income data, a student took the following notes: 1) A policy class analyzed a city's household-income data over five years. 2) Median household income increased each year during the period. 3) The gap between the highest-income and lowest-income neighborhoods also widened. 4) The analysis did not include data from nearby cities. The student wants to use the notes to accurately present the study's finding about median income and income inequality. Which choice best accomplishes this goal?