Suppose in Some Economy There Are 100 Million Workers; 8

Suppose in some economy there are 100 million workers; 8 million of those workers work in retail trade, and 2 million of the retail workers belong to unions. Total union membership in this economy is 30 million. The rate of unionization in the economy is

A) 30 percent, and the rate of unionization in retail trade in 20 percent.
B) 8 percent, and the rate of unionization in retail trade is 2 percent.
C) 30 percent, and the rate of unionization in retail trade is 25 percent.
D) 20 percent, and the rate of unionization in retail trade is 25 percent.