The correct answer is A.
'retailer said' << Past simple is used to describe the situation that ended in the past.
This means that its cause had been happened before the retailer said.
Therefore, past perfect in choice A is the most proper tense.
'retailer said' << Past simple is used to describe the situation that ended in the past.
This means that its cause had been happened before the retailer said.
Therefore, past perfect in choice A is the most proper tense.












