Critical Reasoning (CR) | Over an eleven-month period, during which national retail co

This is how I understand this question:

Premise: Chain's sales went up 200%. Chain's market share went up to 7%.
Issue: After the regulation, Chain's sales kept the same but market share went down to 4%.
Potential Explanation: The market size is larger. When numerator is the same and the denominator gets fatter, the result goes down.

Problem solving thoughts - Focus around the potential explanation. If an option's scenario is not a departure from that explanation, that option is ok.

A, Wrong.
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