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The pitch angle of the tail rotor blades is changed…
  • A
    Collectively by sideways movement of the stick.
  • B
    Collectively as the torque to the main rotor head increases.
  • C
    Collectively by operation of the foot pedals.
  • D
    Cyclically by operation of the foot pedals.

Refer to figures.
Conventional helicopters use a tail rotor to counterbalance the torque reaction. A tail rotor is a smaller version of a main rotor mounted vertically or almost vertically at the end of a tail cone and clear of the main rotor.

The pitch of the tail rotor blades is controlled by the anti-torque pedals (yaw or foot pedals) acting through control runs to the pitch change mechanism. Most modern helicopters use push/pull rods and a few still use cables.

The control rods act on a spider, which adjusts the pitch of all the tail rotor blades collectively (simultaneously).

In simple words, the blades all feather at the same time when the foot pedals are moved, so they move collectively.

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