If We Define $\bar { s } _ { 1 }$

If we define $\bar { s } _ { 1 }$ and $\bar { s } _ { 2 }$
As the saving rates in Countries 1 and 2, respectively, $\bar { d } _ { 1 } = \bar { d } _ { 2 }$
As the depreciation rates in Countries 1 and 2, respectively, and   $\bar { A } _ { 1 }$ And  
$\bar { A } _ { 2 }$ As productivity in Countries 1 and 2, respectively, in the Solow model, the equation ________ predicts that ________ contribute the most to differences in steady-state output per worker.

A) $\frac { y _ { 1 } ^ { * } } { y _ { 2 } ^ { * } } = \left( \frac { \bar { A } _ { 1 } } { \bar { A } _ { 2 } } \right) ^ { 3 / 2 }$ ; productivity differences
B) $\frac { y _ { 1 } ^ { * } } { y _ { 2 } ^ { * } } = \left( \frac { \bar { A } _ { 1 } } { \bar { A } _ { 2 } } \right) ^ { 3 / 2 } \times \left( \frac { \bar { s } _ { 1 } } { \bar { s } _ { 2 } } \right) ^ { 1 / 2 }$ ; saving rate differences
C) $\frac { y _ { 1 } ^ { * } } { y _ { 2 } ^ { * } } = \left( \frac { \bar { s } _ { 1 } } { \bar { s } _ { 2 } } \right) ^ { 3 / 2 } \times \left( \frac { \bar { A } _ { 1 } } { \bar { A } _ { 2 } } \right) ^ { 1 / 2 }$ ; productivity differences
D) $\frac { y _ { 1 } ^ { * } } { y _ { 2 } ^ { * } } = \left( \frac { \bar { A } _ { 1 } } { \bar { A } _ { 2 } } \right) ^ { 3 / 2 } \times \left( \frac { \bar { s } _ { 1 } } { \bar { s } _ { 2 } } \right) ^ { 1 / 2 }$ ; productivity differences
E) $\frac { y _ { 1 } ^ { * } } { y _ { 2 } ^ { * } } = \left( \frac { \bar { s } _ { 1 } } { \bar { s } _ { 2 } } \right) ^ { 1 / 2 }$ ; saving rate differences