Which of the Following Is a Reason That Retaliating Against

Which of the following is a reason that retaliating against terrorism is so difficult?

A) States do not have sufficient military intelligence to find terrorists.
B) Terrorist attacks primarily happen in rural areas where terrorists can easily hide in surrounding countryside.
C) Terrorists rarely take credit for their work to prevent retaliation from occurring.
D) There are few international agreements on terrorism and so the appropriate response is not codified in law.
E) The threat of retaliation may not be credible because terrorists often hide in populous areas.