$CO$ is practically non-polar since

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The bond moment is low

There is a triple bond between $C$ and $O$

The $σ -$ electron drift from $C$ to $O$ is almost nullified by the , $π -$ electron drift from $O$ to $C$

The $σ -$ electron drift from $O$ to $C$ is almost nullified by the $π -$ electron drift from $C$ to $O$

answer is A.

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Detailed Solution

The structure of $CO$ is $: C \equiv O :$

Oxygen is more electronegative than carbon. so there will be some polarity due to this electronegativity difference.
But this molecule contains pi bond which drifts the electrons from oxygen to carbon thus nullifying the polarity and making the molecule non-polar.

In other words,
In CO molecule, C−O σ moment and O−C π−moment cancels each other making it non-polar.

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