In the given phrase, the plural noun 'attempts' incorrectly follows the singular determiner 'an', so the phrase is incorrect. 'Reasonably justify' and 'emotional constrains' are contextually irrelevant to the given sentence which talks about 'triangulation' and thus they are negated. In 'attempt of manipulating', the verb 'manipulating' requires a noun to denote who/what is manipulated. Since it is not given in the sentence, it cannot be used as a replacement for the phrase and thus negated. 'Act of manipulation' is the most appropriate option that is contextually and grammatically correct enough to replace the incorrect phrase that is given in the sentence.
Hence, the correct answer is option (c).
Note:
Determiner: A modifying word that determines the kind of reference a noun or noun group has, for example, 'a', 'the', 'every', 'much', 'many', etc.
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