Joan's Pupil Appears to Get Larger and Then Smaller as She

Joan's pupil appears to get larger and then smaller as she moves from room to room. This change in size is caused by changes in the __________ and is due to changes in __________.

A) fovea; size of her visual field
B) rods and cones; changing visual stimuli
C) pupillary opening; changes from monocular to dichromatic light
D) iris; amount of incoming light

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