Correct option is: (C) But-1-ene
Essential requirement to shows Geometrical isomerism, that, the atom or group of atom attached to some carbon of the double bond should be different and all four atoms or group atoms attached to the double bonded carbon should be in a plane with double bonded carbon.
But-1-ene can not shows geometrical isomerism because two Hydrogen atom attached to the same carbon of double bond.
