The correct answer is B) To offer maximum rotational resistance. Ball or roller antifriction bearings are used to support gas turbine rotors primarily to accommodate both axial and radial loads (A), facilitate precision alignment (C), and withstand high momentary overloads (D). These bearings minimize friction and allow for smooth, efficient rotation of the turbine rotor. However, they are not primarily used to offer maximum rotational resistance (B). In fact, the purpose of these bearings is to minimize resistance and allow for free rotation of the turbine shaft, not to increase it. The other answer choices accurately describe the key functions of these bearings in supporting the gas turbine rotor.