2. Given the curve $y=x^{3}-x$, draw a tangent line to this curve from a point $A(t, 0)$ on the $x$-axis. The maximum number of tangent lines that can be drawn is $(\quad$.
(A) 1
(B) 2
(C) 3
(D) 4
2. C

Translate the text above into English, please retain the original text's line breaks and format, and output the translation result directly.