Take another look at the item:

The potted geranium wilted (A) from lack of water on Terry's kitchen window (B) while the faucet dripped wastefully, (C) staining the porcelain sink with rust.

You wanted to do this:

The potted geranium wilted, from lack of water on Terry's kitchen window while the faucet dripped wastefully, staining the porcelain sink with rust.

The comma after wilted is incorrect. A prepositional phrase at the end of main clause rarely needs punctuation. You need to reconsider your choice.

You might want to review the rules.

Go back to the sentence to try again.

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