If none of the vectors \[\vec{A},\,\,\vec{B}\] and \[\vec{C}\] are zero and if \[\vec{A}\times \vec{B}=0\],\[\vec{B}\times \vec{C}=0\] the value of \[\vec{A}\times \vec{C}\] is:

• A. unity                
• B.        zero
• C. \[{{B}^{2}}\]             
• D.        \[AC\text{ }cos\theta \]