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How can absorption be enhanced while determining NO concentration using CO laser?

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How can absorption be enhanced while determining NO concentration using CO laser?

(a) By converting NO into NO2

(b) By placing NO in a magnetic field

(c) By using proper monochromators

(d) By using choppers

I have been asked this question at a job interview.

This interesting question is from NO2 Analyser in section Industrial Gas Analysers of Analytical Instrumentation

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Right answer is (b) By placing NO in a magnetic field

Easiest explanation: CO laser emits radiation that can absorb NO. Absorption is enhanced by placing NO in a magnetic field.

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