C is the best way to deal with an argument you have to deal with that is not in agreement with your own views.
If you can present facts that show your opponent to be in error, that is the best way to counter an argument. The facts must be honestly obtained and easily verified.
D is also possible, but you do not want to become embroiled in another person's argument. You want to disarm it if you can and leave it at that.
B is not the way to deal with any argument. It sounds like you are attacking the person's psychology for believing something that does not agree with what you believe in. It is never a good policy to do that.
A is wrong as well. You never ignore another person's point of view if you are honest. You recognize its good points and point out the flaws of the argument which makes the idea unworkable. Honest debate between opposing views often brings good results.
Answer:
The writer should use facts that can be verified to address and disprove opposing viewpoints.
