Two p orbitals of atoms can overlap to form a pi bond in any molecule.
Pi bonds are come under the categories of multiple bond as in any molecule first molecule is the sigma bond, and the second bond is the pi bond.
Pi bonds are the result of the side or lateral overlapping of the un-hybrid orbitals. Orbitals which takes part in the formation of pi bonds are p-orbitals and in the pi bonds, electron density is present above or below the pi bond.
Hence, option (a) is correct, i.e. two p-orbitals overlap to form a pi bond.
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