Evaluation - the making of a judgement about the amount, number, or value of something; assessment.
Discrimination -recognition and understanding of the difference between one thing and another.
Prohibitions -the action of forbidding something, especially by law.
Violations - an action that breaks or acts against something, especially a law, agreement, principle, or something that should be treated with respect.
Filling the blank with 'violations' gives the meaning that NGOs are concerned with dealing with the actions that take away people's human rights.
Other options render the sentence meaningless.
Hence, option (d) is the answer.
Study Notes
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