A poultry unit changed the feed given in one shed, and the birds in that shed reached market weight four days sooner than the previous batch raised in the same shed. The owner argues that the new feed is what shortened the time. Which of the following, if true, most strengthens the owner's argument?

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The two batches were of the same breed, were raised in the same months of the year, and were given the same water, the same medicines and the same hours of light; the feed was the only thing altered between them. Breed, season, water, medicine and light are the standing rivals for any change in growth, and holding every one of them fixed leaves the feed as the only thing that differed between the two batches. Ruling out the rivals is what turns the four days from a coincidence into evidence. Sack size, a daily head count and the owner's long experience rule nothing out.

A poultry unit changed the feed given in one shed, and the birds in that shed reached market weight four days sooner than the previous batch raised in the same shed. The owner argues that the new feed is what shortened the time. Which of the following, if true, most strengthens the owner's argument?

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