cho lim f(x)+2=1.tính lim f(x)

A.$\underset{x\to \infty }{\lim }f\left(x\right)=3$

B.$\underset{x\to \infty }{\lim }f\left(x\right)=-1$

C.$\underset{x\to \infty }{\lim }f\left(x\right)=-3$

D.$\underset{x\to \infty }{\lim }f\left(x\right)=1$