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If the lines vector r = a + t(b x c) and vector r = b + s(c x a) intersect (t and s are scalars), then

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If the lines vector r = a + t(b x c) and vector r = b + s(c x a)  intersect (t and s are scalars), then 

(A) a.c = 0

(B) a.c= b.c

(C) b.c = 0 

(D) None of these

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Answer is (B) a. c = b .c

For the point of intersection of the lines

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