Which of the Following Is an Elimination Reaction

Which of the following is an elimination reaction?

A) C₂H₂(g) + H₂(g) → C₂H₄(g)
B) CH₃CH₂CH₂OH(l) → CH₃CHCH₂(g) + H₂O(l)
C) C₃H₆(g) + HCl(g) → C₃H₇Cl(l)
D) CH₃OH(aq) + HCOOH(aq) → C₂H₅−O−CHO(l) + H₂O(l)
E) 2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)