The best translation of "On the other hand, I don't need it" is "Por otra parte, no lo necesito." This option correctly conveys the intended contrast and meaning of the original sentence. Other options do not reflect the intended context of the phrase.
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The correct translation of "On the other hand, I don't need it" is "Por otra parte, no lo necesito." The other options either alter the meaning or do not convey the intended contrast. Therefore, the correct answer maintains both the meaning and context of the original sentence. ;