Answer:
A. Lucy, Chelsey, Jill
Step-by-step explanation:
In the paragraph, it is stated that "Chelsey is older than her sister, Jill," and that "their oldest sister, Lucy, has a room all to herself." This means that Lucy is the oldest sister, followed by Chelsey, and then Jill. Therefore, the correct order from oldest to youngest is A. Lucy, Chelsey, Jill.