Read the following context and choose the best option to answer the question.
Context: Whenever something came to attack him , he would wait a little before swiftly taking them out . No idea why , but if he died , it would be kind of wrong after promising to remain here . Pff . What did he know and not know of being wrong?Still , what 's done was done , as Balthier said . No matter how much he regretted it .
Question: Why would the man take people out when they came to attack him ?
Options: 
A. None of the above choices .
B. He enjoyed being violent so did so at every given opportunity
C. He was trying to increase the statistics of how many people he could kill
D. He was simply acting in self defense , and trying to remain alive


D