Hey, I was doing some practice questions in my textbook, and I came across this one. I am unsure of what goes with what. Can someone help me?

Q: Answer the following questions regarding the PPF using the figures below. Initial production is a point C. # of 12 Production Possibilities # of 12 Production Possibilities # of 12 Production Possibilities pies Frontier 10 pies Frontier pies Frontier C B 10 12 12 2 10 12 14 # of hats # of hats # of hats A B C Represents an shifting of hours of labour from hats to pies, increasing pie production. Choose.. * Represents an improvement in technology to produce hats. Choose.. + Represents an shifting of hours of labour from pies to hats, increasing hat production. Choose.. * Represents an improvement in technology to produce pies. Choose.. *