Table 21-4 Quintile Shares of Income by Quintile (Percent) 2000 2010 2019 Bottom Quintile 4.3 3.8 3.9 Second Quintile 9.8 9.4 9.2 Middle Quintile 15.4 15.4 14.8 Fourth Quintile 22.7 23.5 22.5 Top Quintile 47.7 47.9 49.5 Source: U.S. Bureau of Census Refer to Table 21-4. Comparing data from 2000 and 2019, which of the following statements is correct? a. Overall income inequality has improved because the share held by the bottom quintile has declined by 0.5%. b. Overall income inequality has improved because the share held by the second quintile has declined by 0.6%. c. There has been no change in overall income inequality because the share of income held by the fourth quintile is nearly identical. d. Overall income inequality has worsened slightly, as shown by the simultaneous increase in the share of income held by the top quintile and the decrease in the share of income held by the bottom quintile