Under Which of the Following Circumstances Would Private Saving Be

Under which of the following circumstances would private saving be positive in a closed economy?

A) Y = $10 trillion C = $5 trillion TR = $2 trillion G = $2 trillion public saving = $1 trillion
B) Y = $9 trillion C = $5 trillion TR = $1 trillion G = $1 trillion public saving = $3 trillion
C) Y = $8 trillion C = $2 trillion TR = $4 trillion G = $2 trillion public saving = $4 trillion
D) Y = $6 trillion C = $2 trillion TR = $8 trillion G = $3 trillion public saving = $1 trillion