Concept:The series follows a repeating multiplication pattern.Explanation:Check the multipliers between consecutive terms.7×2=1414×4=5656×3=168168×2=336336×4=1344The multipliers repeat as ×2, ×4, ×3.So the next term should be 1344×3=4032, not 2688.Then 4032×2=8064, which matches the last term.Hence 2688 is the odd term.Answer:2688 should be replaced by 4032.Correct option: C (4032).