# If the resultant of the vector  is unit vector along the y direction t, tan $\stackrel{\to }{C}$ is: A)  - $2\stackrel{^}{i}$- $\stackrel{^}{k}$                 B)    - $2\stackrel{^}{i}$ + $\stackrel{^}{k}$             C)   $2\stackrel{^}{i}$ - $\stackrel{^}{k}$        D) $2\stackrel{^}{i}$ + $\stackrel{^}{k}$

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