Some Researchers Have Compared Visual Attention to a Searchlight Beam

Some researchers have compared visual attention to a searchlight beam sweeping across the visual field. Which of the following claims about this beam is NOT currently supported by evidence?

A) It is possible to split the beam of visual attention, so that two nonadjacent positions are both within the beam.
B) Movements of attention can be separate from movements of the eye.
C) The beam of visual attention can be adjusted by the participant, so that it is sometimes wide and sometimes narrow.
D) Stimuli inside the beam of visual attention are primed, promoting their perception.