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

Guys,

option A is correct if we are not given a "4-month" clause in the statement. It is same with B. However, in option D we have something- "other dramatic changes in other market forces caused the decline"- does that make sense? Isn't it something out of passage?

Please if somebody could elaborate on the OA.

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