Respuesta :
The answer is B. A frame of reference that is accelerating.
General relativity, rather than special relativity, must be used for frame of reference that is accelerating.
What is frame of reference?
An inertial frame of reference is a frame of reference in which the Newton's laws are valid. In this frame of reference, the objects do not accelerate without any external force. All frames of reference moving with constant velocity or at rest relative to an inertial frame of reference are also inertial frames of reference
In a non-inertial frame of reference, the Newton's laws will not work. They are moving with an acceleration.
Thus, the correct option is B.
Learn more about frame of reference.
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