Verified Answer :

It would be sound because of grumbling growing to a mighty rumbling

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Answer:

The sense that is being appealed in this line is sound.

Explanation:

The grumbling is compared in this line to a mighty rumbling, to a strong sound that penetrates in the head. A boom that reverberates. By reading those carefully chosen adjectives that the author uses in order to create a proper image of the sound in the reader's head, the audience can imagine how deep and strong the grumbling was and that is the main objective of this literary device.