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What is the principle behind which opacity monitors/transmissometers work?

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What is the principle behind which opacity monitors/transmissometers work?

(a) Change in capacitance for various gaseous media, between two stationary plates

(b) Pressure exerted by a fixed volume of gas enclosed in a container of specific dimension

(c) Scattering of light transmitted through a gas stream

(d) None of the mentioned

This question was addressed to me in an online interview.

My question is taken from Air Pollution in section Air Pollution of Environmental Engineering

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The correct choice is (c) Scattering of light transmitted through a gas stream

Explanation: Like the name suggests, opacity monitors or transmissometers work by transmitting light into a particular stream of gas, and gives information regarding the combustion conditions and efficiency.

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