The effects of mora's shift are best explained by, she is present with her audience when she delivers her speech.
The wavelength of emission is shortened or lengthened when a body emitting energy has a non-zero angular velocity relative to an observer.
It depends on whether the object is moving towards or away from the observer.
The Doppler shift refers to the change in wavelength or frequency noticed.
Thus, the correct option is B, she is present with her audience when she delivers her speech; she is not with her readers when they read her essay.
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