Jameson dropped and broke the cookie jar while his parents were on vacation. What is the best explanation for why the writer would revise this sentence to use passive voice? The writer does not know who dropped the cookie jar. The writer does not know how the cookie jar broke. The writer wants to conceal the identity of the person who broke the jar. The writer wants to conceal the location of the broken cookie jar.

The writer wants to conceal the subject's identity (Jameson). He knows who dropped it, he knows how it broke (it was dropped), and he knows where through inference (parents on vacation). Hiding the doer's/subject's identity is one of the basic uses of the passive voice. Other reasons could be purposely keeping the drama low (ironic effect, anticlimax; more elaborate would be its use to heighten dramatic climax, for instance through seeming out of place for the intensity of what is being described, as it makes one question the state og the narrator: what reasons can he have to deviate so drastically / dramatically from expected literary craftmanship.