We can actually deduce here that the effect of the adverb in the sentence is: C. It modifies the manner in which Greg ran.
An adverb is actually known to be a part of speech which is used to modify a verb or an adjective. Adverbs tell us the manner, way, pattern or place that a particular verb or adjective is carried out.
In other words, adverbs are used to give more information about verbs, adjectives and even adverbs in a sentence.
It usually expresses the place, manner, degree, time, circumstance, and cause in a sentence.
Thus, less confidently tells us the manner Greg ran.
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