The figure below shows Avery’s weekly production possibilities curve for scarves.Avery’s PPC would shift outward if she:

A.knits fewer red scarves and more blue scarves each week.

B.knits more red scarves and fewer blue scarves each week.

C.devotes less time to knitting each week.

D.devotes more time to knitting each week.

正确答案：devotes more time to knitting each week.