Concept:In a number series, the terms must follow a consistent pattern, such as a fixed addition.Explanation:Find the differences between consecutive terms:57−26=31, 68−57=11, 89−68=21, 110−89=21.These differences are not consistent.Now check the pattern of adding 21 each time:26+21=4747+21=6868+21=8989+21=110This pattern works only if 57 is replaced by 47.So 57 does not fit the series.Answer:The odd term is 57, which is Option D.