Take another look at the item:

Coated with dust, (A) the blinds filtered shadowy light into Adrian's cluttered apartment, (B) where clothing and empty take-out boxes littered the floor. (C) As flies buzzed around rotting bananas on the kitchen counter.

You wanted to do this:

Coated with dust, the blinds filtered shadowy light into Adrian's cluttered apartment. Where clothing and empty take-out boxes littered the floor. As flies buzzed around rotting bananas on the kitchen counter.

Adding a period after apartment makes a fragment. Where clothing and empty take-out boxes littered the floor is a subordinate clause and cannot stand alone as a sentence.

You might want to review the rules.

Go back to the sentence to try again.

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