Which of the Following Is Not a Conclusion Reached by Benmelech

Which of the following is not a conclusion reached by Benmelech and Berrebi in their study of Palestinian suicide bombers?

A) Suicide bombers who are younger and less educated are more likely to be caught on their missions.
B) Suicide bombers who are older and more educated are more likely to kill large numbers of people.
C) 60% of the most successful bombers were college educated.
D) 40% of college-educated bombers decided not to proceed with their bombing plot because they reassessed the value of their lives.