29. Let $\vec { a } = \vec { \imath } - \vec { k } , \vec { b } = x \vec { \imath } + \vec { \jmath } + ( 1 - x ) \vec { k }$ and $\vec { c } = y \vec { \imath } + x \vec { \jmath } + ( 1 + x - y ) \vec { k }$. Then $[ \vec { a } , \vec { b } , \vec { c } ]$ depends on :\\
(A) Only x\\
(B) Only $y$\\
(C) Neither $x$ nor $y$\\
(D) Both $x$ and $y$
\section*{III askllTians III}
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