PARALLELISM & COMPARISON: the comparison must be made between individuals of one genetic composition and individuals of another genetic composition. Therefore, A and E are wrong because "that" is singular; we're supposed to be comparing individuals (plural). B and C are wrong because "other"/"another" refers to another genetic composition; therefore, these are faulty comparisons, because there's no word to suggest individuals (we MUST compare individuals to other individuals, not to a composition).