The Accompanying Figure Shows Avery's Weekly Production Possibilities Curve for Scarves

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

A) knits more red scarves and fewer blue scarves each week.
B) devotes less time to knitting each week.
C) devotes more time to knitting each week.
D) knits fewer red scarves and more blue scarves each week.