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Which of these flow properties does not suit covariant or contra-variant bases?

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Which of these flow properties does not suit covariant or contra-variant bases?

(a) Velocity

(b) Density

(c) Stress

(d) Viscous forces

I had been asked this question during an internship interview.

The query is from Numerical Methods in chapter Numerical Methods of Computational Fluid Dynamics

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The correct option is (b) Density

To explain: Covariant or contra-variant bases can be used only with vectors or tensors. They cannot be used with scalars. Here, Velocities stress and forces all come under either vectors or tensors. Density is a scalar property. So, it cannot be represented using covariant or contra-variant bases.

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