Correct Answer: Option A

Explanation

the trader ''complained'' is a (past tense) and (past participle). this means that, the event had already taken place in the past. 

the word ''robbed'' is in its past tense as well. 

had  is also a (past tense) and a (past participle) mostly used to narrate an event or experience undergone in the past. it rightly completes the space on the question.

There is an explanation video available below.

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