Microsoft Filed a Lawsuit Against People Who Sent Spam (Junk

Microsoft filed a lawsuit against people who sent spam (junk email) and a website owner who hosted spam services. A spokesman for Microsoft said that Microsoft was "trying to change the economics of spam" by increasing the cost of being a spammer. An economist most likely would agree with which statement about Microsoft's actions?

A) A more effective approach would be to educate spammers about the costs they impose on others.
B) A more effective approach would be to appeal to the morals of the spammers and tell them to follow the Golden Rule.
C) Microsoft's approach of trying to change the costs of spamming is the most efficient way to change behavior.
D) Microsoft should not be involved because spamming is just part of the invisible hand at work and should be left alone.