Lời giải

Chọn B

· \(\mathop {lim}\limits_{x \to {1^ + }} f\left( x \right) = - \infty \) suy ra TCĐ: \(x = 1\).

· \(\mathop {lim}\limits_{x \to {5^ - }} f\left( x \right) = - \infty \) suy ra TCĐ: \(x = 5\).

· \(\mathop {lim}\limits_{x \to + \infty } f\left( x \right) = 4 \Rightarrow TCN:y = 4\).