Why Aren't Web Sites Better at Making Successful Relationship Matches

Why aren't Web sites better at making successful relationship matches?

A) Our personalities aren't the only predictors of relationship satisfaction.
B) Evolution wins out and helps us pick the best mate.
C) We are 100% accurate about what we want in a partner, and perfection is not always attractive.
D) Web sites often pair people with someone far away, and it's impossible to have compatibility with someone so distant.