Greta Starts Using a New Baking Technique, and She Can

Multiple Choice

Greta starts using a new baking technique, and she can now do twice as much of everything. In a single day Greta can now make 10 cakes or 8 pies, rather than the 5 cakes and 4 pies she could previously bake. Greta's production possibility frontier has _____, but her opportunity costs of making pies _____.

A) shifted right; are unchanged
B) shifted right; have decreased
C) not changed; have increased
D) not changed; have decreased