Looking at the record of concentration in the United States during the last century, one finds concentration has
A)steadily increased.
B)risen dramatically in the past 15 years.
C)changed very little.
D)fallen steadily except in wartime.

Question

Quizplus · Accepted Answer

Over the last century, the concentration in the United States has changed very little, with periods of both increase and decrease, but no consistent trend of steady increase or decrease.

Looking at the Record of Concentration in the United States