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Why does magvar have diurnal change?

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Why does magvar have diurnal change?

(a) Magnetic pole migration

(b) Static buildup error

(c) Sensitivity of the instruments

(d) Variation in aircraft magnetic effects

This question was addressed to me in final exam.

I'm obligated to ask this question of Vertical & Heading References in chapter Air Data Systems, Altitude and Heading Reference of Avionics

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The correct option is (a) Magnetic pole migration

Easy explanation: Magvar has a diurnal change, a long term change due to the migration of magnetic poles, and random changes because of magnetic storms. The magnitude of the magnetic field changes about 0.5% per year.

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