In the context of minor solfege syllables, the syllables typically used are: la, ti, do, re, mi, fa, and se, with "se" often representing the raised sixth scale degree.
From the options you provided, "ra" and "te" are usually not used as minor solfege syllables. However, "te" often represents the lowered seventh scale degree in some systems, but in traditional minor solfege (natural minor), it's not standard. So, "ra" is the most definitive answer as it is not a recognized solfege syllable in the minor scale context.
Thus, the answer is ra.