Concept:Identify the number that breaks the pattern in the series.Explanation:Write the given terms: 76,80,86,88,92.Check the differences: 80−76=4, 86−80=6, 88−86=2, 92−88=4.The expected pattern is a constant increase of +4.So the correct series should be 76,80,84,88,92.Here, 86 is incorrect and should be 84.Answer:86 (Option A)