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Why is the static source errors compensated in helicopters?

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Why is the static source errors compensated in helicopters?

(a) Due to difference in rotor down wash

(b) Not economical

(c) Requires high computational power

(d) Static source error does not matter

I had been asked this question by my school principal while I was bunking the class.

My question comes from Helicopter, Optical and Hyper Sonic Air Data topic in portion Air Data Systems, Altitude and Heading Reference of Avionics

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Correct answer is (a) Due to difference in rotor down wash

Best explanation: Static-source errors in helicopters tend to be difficult to compensate because of rotor downwash that differs significantly in and out of ground effect. Fixed wing aircraft do not compensate for static source errors in ground effect, and neither do helicopters.

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