A system is said to be inconsistent if _______

Question

$(A) \;\large\frac{a_1}{a_2} \neq \frac{b_1}{b_2} = \frac{c_1}{c_2} \\(B)\; \large\frac{a_1}{a_2} = \frac{b_1}{b_2} = \frac{c_1}{c_2} \\(C)\;\large\frac{a_1}{a_2} = \frac{b_1}{b_2} \neq \frac{c_1}{c_2} \\(D)\;none\;of\;the\;above$