The corrected verb tense is:
Some contractors in Iraq who were found to be deceptive used bait-and-switch hiring practices and charged recruiting fees that indebted low-paid migrant workers.
The correction that was effected above was to ensure that there was proper subject-verb agreement as well as correct use of verb tense
Notice that the missing words were all in past tense which is in agreement with the words such as "charged" used in sentence. Hence, the correct answer is B.
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