Benzene is a resonance hybrid mainly of two Kekule structures. Hence :

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Two structures make equal contribution to resonance hybrid.

At low temperatures benzene can be separated into two structures.

Half of the molecules correspond to on structure, and half of the second structure.

An individual benzene molecule changes back and forth between two structures.

answer is C.

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Detailed Solution

Each carbon atom in benzene is connected to two other carbon atoms in Kekule's structure, which arranges the carbon atoms in a hexagonal ring.
There are alternate single and double bonds in the ring.
The electrons in benzene that cause these double bonds are present.

These electrons have the ability to delocalize and create two distinct double bond positions in their structures.

These contribute to resonance. In order to create a resonance hybrid, they both contribute equally.

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