In 2000, the richest 20% of families in America receive about 49.4% of the nation's income, while the lowest 20% receives about 3.6% of the nation's income. The inequality ratio between the rich and the poor based on the above information is (blank).

a) 5.3
b) 20
c) 13
d) 160

Please select the correct inequality ratio between the rich and the poor based on the given information.