In the place of the blank is required to qualify the verb 'devastating'. 'Vaguely' (in a way that is uncertain, indefinite or unclear; roughly), 'randomly' (without method or conscious decision) and 'seldom' (not often; rarely) are contextually irrelevant to the given sentence and so, these options are negated. Option (c), 'quite' (to the utmost or most absolute extent or degree; absolutely; completely) is the most relevant word that defines the way how the verb 'devastating' is and so, it can fill the blank.
Hence, the correct answer is option (c).
Note:
Qualifiers: A word or phrase that limits the meaning of another word or phrase or makes it less general. 'Adverbs' and 'adjectives' are qualifiers.
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