How could this be accomplished?

LenoxSoft’s corporate marketing team wants to ensure their website visitors who originate from Europe are able to opt into having their website activity tracked.

How could this be accomplished?
A . Remove tracking code from the website and create new sites for each country.
B. Create visitor filters for prospects that are known to be located in Europe.
C. Enable tracking opt-in preferences for visitors from specific countries.
D. Enable tracking opt-in preferences for all website visitors.

Answer: B