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Why is the inertial navigation system combined with celestial navigation system?

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Why is the inertial navigation system combined with celestial navigation system?

(a) Correction of drift error

(b) Deriving true north

(c) Deriving magnetic north

(d) Correction for weather effects

I had been asked this question in exam.

This intriguing question comes from Stellar Inertial Navigation Theory topic in section Celestial Navigation, Doppler and Altimeter Radars of Avionics

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Correct answer is (a) Correction of drift error

Easy explanation: Inertial navigational suffer from drift after long hours of using. Since the position error growth of these free inertial navigation systems was excessive on long flights, it was natural to periodically update their position with position updates from manual star fixing.

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