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If the straighat lines x=1+s,y=-3-lamdas...

If the straighat lines `x=1+s,y=-3-lamdas,z=1+lamdas and x=t/2,y=1+t,z=2-t` with parameters s and t respectively, are coplanar, then `lamda` equals (A) `-1/2` (B) `-1` (C) `-2` (D) `0`

A

`-2`

B

`-1/2`

C

`1/2`

D

0

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