1. Let $a, b, c \in \mathbf{R}$ and $a b \neq 0$, then the number of different lines that the equation $y=\left(\frac{a}{|a|}+\frac{b}{|b|}+\frac{c}{|c|}\right) x$ can represent is ( ).
A. 2
B. 3
C. 4
D. 5
$$
\text { 1. } \mathrm{C}
$$

Discuss the signs of $a, b, c$, the answer is $\mathrm{C}$.