Which of These Is a Viable Solution to the Problem

Multiple Choice

Which of these is a viable solution to the problem of multicollinearity?
(I) Ignore it
(II) Drop one of the collinear variables
(III) Transform the highly correlated variables into a ratio
(IV) Take the logs of the variables

A) I only
B) I and II only
C) I, II and III only
D) I, II, III and IV