an increase in air speed, makes more lift and drag and would make the blade fly to a higher point, if the pilot did nothing. but that would change the disc attitude (flapback) and the helicopter would slow down. the pilot must hold the disc level (slightly forward) with cyclic, to fly strait and level, so we cant let this happen. all these things that are mentioned earlier are compensated for, by the pilot. in forward flight there is less pitch on the advancing blade to stop it increasing in lift with the extra air speed , and more pitch on the retreating blade to produce the same lift at the reduce air speed (on that side, in forward flight).
advancing blade - faster air flow, less pitch, less induced drag but higher parasitic drag.
retreating blade - slower airflow, more pitch, more induced drag but less parasitic drag. same lift! theorfore same total drag (if lift is uneven the disk tilts and you start to fly that way)
i dont think its any of the answers but questions like that dont usualy consider the pilots reactions so i would have locked in (D) all of the obove!
