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The judges continue in paragraph 12, "The determination of when the targeted part is substantial enough to meet this requirement may involve a number of considerations. The numeric size of the targeted part of the group is the necessary and important starting point, though not in all cases the ending point of the inquiry. The number of individuals targeted should be evaluated not only in absolute terms, but also in relation to the overall size of the entire group. In addition to the numeric size of the targeted portion, its prominence within the group can be a useful consideration. If a specific part of the group is emblematic of the overall group, or is essential to its survival, that may support a finding that the part qualifies as substantial within the meaning of Article 4 [of the Tribunal's Statute]."

The number of people targeted in a genocide should not be solely evaluated by what?
absolute terms
The judges in paragraph 12 state that the number of people targeted should be evaluated not only based on their absolute terms. They further mention other factors that can also influence this evaluation, such as prominence within a group and how emblematic they are to the overall group or how essential they are for its survival.
Thus, it is best to answer with "absolute terms"..