Event I: Many flights at the city airport were delayed in the morning. Event II: Many trains around the city ran late in the morning, and drivers reported very poor visibility. Which option best describes the relationship between the two events?
Correct answer A. Both events are effects of a common cause
Explanation
Flight delays do not cause train delays, nor the reverse. Poor visibility points to a common cause, such as dense fog, that slowed both air and rail traffic.
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