A and B
Poll

And I will put enmity
Between you and the woman,
And between your seed and her seed;
He shall bruise you on the head,
And you shall bruise him on the heel.” Gen 3:15
If you read Genesis you will know that God is talking to the serpent/Satan in this verse. The woman's seed is Christ the Son of Man, so if there is enmity between Christ and Satan then I do believe that there is enmity between us and Satan also. Because we follow Christ and Satan doesn't want us to.
So I think the answer is A.
Question: Do you believe that the devil lives, and acts against you if you are a christian?
Answers;
A)Yes. B)No. C)What? D)Maybe, I am not sure.