The correct option is
C In benzylic halide, halogen atom bonded to a
sp3−C atom which is directly attached to a benzene ring.
Hence, c is an example of benzylic halide.
In vinylic halide, halogen atom is attached to a
sp2−C atom of a carbon-carbon double bond
C=C. Thus, b is vinylic halide.
In allylic halide, halogen atom is attached to a
sp3−C atom adjacent to a carbon-carbon double bond
C=C. Thus, a and d are allylic halide.