Differentiate IAS, CAS, and TAS with respect to aircraft performance.

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The key idea is how the three airspeed terms relate to what you actually measure and what the air around you is doing. Indicated airspeed is the readout you get from the airspeed indicator, based on dynamic pressure. It doesn’t correct for instrument or installation quirks, so it’s the raw display. Calibrated airspeed takes those instrument and installation corrections into account, giving a speed that matches what the aircraft would experience if the system were perfectly accurate. True airspeed is the actual speed of the aircraft through the air mass, and it varies with altitude and air density—at higher altitudes the air is thinner, so the same indicated speed corresponds to a higher true airspeed.

So, the best description is that indicated airspeed is the readout on the instrument, calibrated airspeed corrects for instrument/installation errors, and true airspeed is the real speed through the air, which changes with altitude and density. The other statements either omit the altitude/density effect on true airspeed or misstate what the corrections apply to.