Checking which adverb stays consistent with the well-established character trait of a "miser" across the sentence, rather than judging each word in isolation, narrows this down quickly.
Matching the adverb to the well-known character of a miser confirms that only "avidly" stays true to that portrayal.
Therefore, the correct answer is avidly.
Poetic Devices: Identify the poetic device used in the following line: "The wind whispered through the trees."