This question is from kaplan, i couldnt understand the answer. I thought technology concern is not correct.
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You're right that the plural verb "concern" wouldn't go with the singular noun "technology." However, in this case, it is the "complaints" that "concern" is referring to, not "technology."
I agree with the explanation given: the most important thing to look for here is parallel construction (you can easily spot this by noticing that the sentence makes a list; all items in the list must be parallel in form).
