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Which voltage is neutralized in voltage commutation process?

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Which voltage is neutralized in voltage commutation process?

(a) Armature

(b) Reactance

(c) Field

(d) Cannot be determined

This question was posed to me in an interview for job.

This intriguing question comes from Commutation Process -1 topic in chapter Commutation Process & Excitation Methods of DC Machines

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Right option is (b) Reactance

Explanation: To speed up the commutation process, the reactance voltage must be neutralized by injecting a suitable polarity dynamical (speed) voltage into the commutating coil. In order that this injection is restricted to commutating coils, narrow interpoles are provided in the interpolar region.

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