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Two months in a row, sales of X rose with rainfall. Conclusion?

ARain causes X sales.
BX causes rain.
CTwo months prove nothing.
DPattern is suggestive, not proven.
Answer & Solution
Correct answer: D. Pattern is suggestive, not proven.
1. Short series suggests but doesn't prove causation. _Source: 501-GMAT-Questions Ch 2 Critical Reasoning_
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