Which would be the best option for finding the limit?

Question

lim (1-2x-3x^2)/1+x
x->-1

A.Direct substitution
B.Dividing out technique
C.Rationalization technique
D.Indeterminate form

Answer 1

Since (1-2x-3x^2)/(1+x)
= (1+x)(1-3x)/(1+x)
= 1 - 3x, x ≠ - 1

what do you think you should use