` `(A) `L_1, L_2, L_3` are concurrent, if
(B) One of `L_1, L_2, L_3` is parallel to at least one of the other two, if
(C) `L_1, L_2, L_3` form a triangle, if
(D) `L_1, L_2, L_3` do not form a triangle, if
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(p) k = -9
(q) `k = -6/5`
(r) `k = 5/6`
(s) k = 5
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