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I say you should pick answer 1. an HR makes more sense since she is interested in a topic about the legality of different situations that are related to workers and their employers.
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The results of a psychological research can be used for malignant purposes, such as fooling individuals through their emotions, using propaganda to change beliefs, and manipulating others through the media.
But it can also be used for good – which is what the question is asking. It is clear that from the available options, only (D) improving communication and relationships are an example of how psychological research is used for good.