|Question 20Verbal

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Text
Consider the mechanics of the pinhole camera: light passes through a small hole, resulting in a focused projected image. A ray diagram reveals how this _____ the hole's small size restricts light to a single ray, all light passing through the hole can only arrive at a single destination, eliminating diffraction and ensuring a clear image.
Which choice completes the text so that it conforms to the conventions of Standard English?
works because
A
works. Because
B
works, it's because
C
works: it's because
D