In 1990, nearly 80% of people in the United States reported that they knew someone who had been diagnosed with cancer. In 2010, that percentage remained unchanged yet cancer incidence rates in the population increased by over 40% from 1990 to 2010.

Which of the following, if true, would best explain how the percentage of people who knew someone with cancer could have remained unchanged despite the dramatic increase in the incidence of cancer?

Correct answer marked below

Improved treatment options dramatically reduced cancer mortality rates from 1990 to 2010.

From 1990 to 2010, most new cases of cancer occurred in densely populated urban centers with previously high cancer rates.

Correct

Many of the new cancer cases from 1990 to 2010 occurred in geographically isolated regions where little or no cancer had been present before.

From 1990 to 2010, some of the new cancer cases occurred in people who had previously been diagnosed with another form of cancer.

Because of dramatic technological improvements in diagnostic tools from 1990 to 2010, cancer was more likely to be diagnosed in 2010 than in 1990.

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What this question tests

Whether you can explain an apparent contradiction in a way that makes both facts true.

Picking an option that explains one side of the paradox while making the other side false.