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_