As Thomas's income rose over the last 20 years so has his stress level.

Select one:

A.

Positive correlation; direct cause

B.

Negative correlation; common underlying cause

C.

Positive correlation; common underlying cause

D.

Positive correlation; coincidence




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When gasoline prices fall, the number of cars on the freeways increases.

Select one:

A.

Negative correlation; direct cause

B.

Positive correlation; direct cause

C.

Positive correlation; common underlying cause

D.

Negative correlation; common underlying cause

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Number of appliances sold and revenue of appliance store