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# pi bond is formed,

$(A)\;\text{by transference of electrons } \\ (B)\;\text{by the overlapping of atomic orbitals on the axis of the nuclei} \\(C)\;\text{by sidewise overlapping of half filled p-orbitals } \\(D)\;\text{by overlapping of s-orbitals with p-orbitals }$

$\pi$ bonds are formed by sideways overlap of unhybridised p and d-orbitals.
Hence C is the correct answer.