Question

Are suicide bombings related to religious fundamentalism?

No, suicide bombers have no significant ties to religious fundamentalism.
Yes, because suicide bombers primarily target religious institutions.
No, religious fundamentalists believe suicide is not a path to heaven.
Yes, some suicide bombers may believe they are fulfilling a sacred duty.

Answer 1

It can be related but as we say in social science, correlation is not causation.

As such, D is correct as some believe that using suicide bombing is their way of fulfilling a sacred duty. Suicide bombing is merely the vehicle by which they are fulfilling, however misguided, their religious duty.