In ANOVA the Relative Contribution of a Factor X Is $$\omega ^ { 2 } x = \frac { S S _ { x } / d f _ { x } } { S S _ { e r r o r } }$$

In ANOVA the relative contribution of a factor X is calculated as ________.

A) $$\omega ^ { 2 } x = \frac { S S _ { x } / d f _ { x } } { S S _ { e r r o r } }$$
B) $$\omega ^ { 2 } x = \frac { S S _ { x } - \left( d f _ { x } \times M S _ { \text {crror } } \right) } { S S _ { \text {total } } + M S _ { \text {crror } } }$$
C) $$\omega ^ { 2 } x = \frac { \left( S S _ { x 1 } + S S _ { x 2 } + S S _ { x 1 x 2 } \right) / d f _ { x 1 } } { S S _ { \text {total } } + M S _ { \text {error } } }$$
D) $$\omega ^ { 2 } x = \frac { S S _ { x } / ( c - 1 ) } { S S _ { c r r o r } / ( N - c ) }$$