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The addition of open loop zero pulls the root loci towards:

(a) The left and therefore system becomes more stable

(b) The right and therefore system becomes unstable

(c) Imaginary axis and therefore system becomes marginally stable

(d) The left and therefore system becomes unstable

The question was posed to me during an interview for a job.

My question is taken from The Root Locus in chapter The Root Locus Technique of Control Systems

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Right choice is (a) The left and therefore system becomes more stable

The best I can explain: The system can become stable by reducing the damping and also by adding zeroes in the s plane and  moving left of the s plane system becomes more stable.

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