CORRECT ANSWER IS OPTION C)GEOMETRICAL ISOMERS
Geometrical isomerism is due to restricted rotation about the double bond.
The prefixes syn and anti are used to denote geometrical isomerism.
Syn: it is used to indicate that both H and OH are present on the same side of the double bond.
Anti: it is used to indicate that H and OH are present on the opposite sides of the double bond.
Hence, the answer is geometrical isomers.