The dominant literary device used in the given lines is:

C. paradox

A paradox is a statement or situation that appears contradictory or self-refuting but may reveal a deeper truth. In the provided lines, the speaker expresses conflicting emotions and states that they "fear and hope" and "burn and freeze like ice," creating a paradoxical effect. The juxtaposition of opposing elements conveys a sense of internal conflict or contradiction within the speaker's emotions.