A country's production possibility curve (PPC) shifts from $\text{PPC}_1$ to $\text{PPC}_2$. What might bring about this change in the PPC?
- Abetter education: false; higher investment: false; lower unemployment: true
- Bbetter education: false; higher investment: true; lower unemployment: false
- Cbetter education: true; higher investment: false; lower unemployment: true
- Dbetter education: true; higher investment: true; lower unemployment: false