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Verbal·Standard English Conventions·Boundaries

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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?

A

works because

B

works. Because

C

works, it’s because

D

works: it’s because