The distribution of income among African-American families is more even than it is for the population as a whole

While falling prey to the seductive ways of Catwoman, Batman sacrifices the opportunity of protecting Gotham City from a crime spree initiated by the Joker. That foregone opportunity is a(n) ________ cost of (yet again) falling prey to Catwoman

A) monetary B) explicit C) sunk D) implicit

Suppose that the consumer price index has risen from 100 to 200. From this information we can conclude that

a) each person's real income was cut in half b) consumer incomes are doubled c) the prices in an average consumer's basket have doubled d) all consumer good prices are doubled e) all prices in the economy are doubled