A long cylindrical shell carries positive surface charge σ in the upper half and negative surface charge −σ in the lower half. The electric field lines around the cylinder will look like figure given in :(figures are schematic and not drawn to scale)

Option (D) has field lines which are not continuous and sharply changing direction, hence it is not correct. The given system should have the field lines similar to that of an electric dipole with field lines originating at the positive charges and terminating at the negative charges and continuous nearer to the sphere. Option (A) is correct.